MC-5810: Improve naming of the critical variables/parameters in the code and configuration

- Renamed render_template to master_template
- Renamed is_visible to is_system
- Renamed renderChildTemplate to masterTemplate
- Renamed previewChildTemplate to childTemplate
- Renamed renderTemplate and previewTemplate to template

Author: Hwashiang Yu

app/code/Magento/PageBuilder/Test/Mftf/Data/ProductAttributeData.xml

@@ -16,18 +16,18 @@
         <data key="is_required">false</data>
         <data key="is_unique">false</data>
         <data key="is_searchable">false</data>
-        <data key="is_visible">true</data>
+        <data key="is_system">true</data>
         <data key="backend_type">text</data>
         <data key="is_wysiwyg_enabled">false</data>
-        <data key="is_visible_in_advanced_search">false</data>
-        <data key="is_visible_on_front">true</data>
+        <data key="is_system_in_advanced_search">false</data>
+        <data key="is_system_on_front">true</data>
         <data key="is_filterable">false</data>
         <data key="is_filterable_in_search">false</data>
         <data key="used_in_product_listing">false</data>
         <data key="is_used_for_promo_rules">false</data>
         <data key="is_comparable">true</data>
         <data key="is_used_in_grid">false</data>
-        <data key="is_visible_in_grid">false</data>
+        <data key="is_system_in_grid">false</data>
         <data key="is_filterable_in_grid">false</data>
         <data key="used_for_sort_by">false</data>
         <requiredEntity type="FrontendLabel">ProductAttributeFrontendLabel</requiredEntity>

app/code/Magento/PageBuilder/etc/adminhtml/di.xml

@@ -498,13 +498,13 @@
             <argument name="rootContainerConfig" xsi:type="array">
                 <item name="label" xsi:type="string">Root Container</item>
                 <item name="component" xsi:type="string">Magento_PageBuilder/js/content-type/root-container/content-type-collection</item>
-                <item name="is_visible" xsi:type="string">false</item>
+                <item name="is_system" xsi:type="string">false</item>
                 <item name="appearances" xsi:type="array">
                     <item name="default" xsi:type="array">
                         <item name="default" xsi:type="string">true</item>
                         <item name="reader" xsi:type="string">Magento_PageBuilder/js/master-format/read/configurable</item>
                         <item name="preview_template" xsi:type="string">Magento_PageBuilder/content-type/preview-collection</item>
-                        <item name="render_template" xsi:type="string">Magento_PageBuilder/content-type/master-collection</item>
+                        <item name="master_template" xsi:type="string">Magento_PageBuilder/content-type/master-collection</item>
                     </item>
                 </item>
             </argument>

app/code/Magento/PageBuilder/etc/content_type.xsd

@@ -14,7 +14,7 @@
                     <xs:complexType>
                         <xs:all>
                             <xs:element type="xs:string" name="preview_template" minOccurs="0"/>
-                            <xs:element type="xs:string" name="render_template" minOccurs="0"/>
+                            <xs:element type="xs:string" name="master_template" minOccurs="0"/>
                             <xs:element type="parents" name="parents" minOccurs="0" maxOccurs="1"/>
                             <xs:element type="children" name="children" minOccurs="0" maxOccurs="1"/>
                             <xs:element name="appearances" minOccurs="0" maxOccurs="1">
@@ -25,7 +25,7 @@
                                 </xs:complexType>
                             </xs:element>
                             <xs:element type="additional_data" name="additional_data" minOccurs="0" maxOccurs="1"/>
-                            <xs:element type="xs:string" name="is_visible" minOccurs="0"/>
+                            <xs:element type="xs:string" name="is_system" minOccurs="0"/>
                         </xs:all>
                         <xs:attribute type="xs:string" name="name" use="required"/>
                         <xs:attribute type="xs:string" name="translate" use="optional"/>
@@ -60,7 +60,7 @@
         <xs:attribute type="xs:string" name="name" use="required"/>
         <xs:attribute type="xs:boolean" name="default" use="optional"/>
         <xs:attribute type="xs:string" name="preview_template" use="optional"/>
-        <xs:attribute type="xs:string" name="render_template" use="optional"/>
+        <xs:attribute type="xs:string" name="master_template" use="optional"/>
         <xs:attribute type="xs:string" name="reader" use="optional"/>
     </xs:complexType>
     <xs:complexType name="parents">

app/code/Magento/PageBuilder/etc/content_type_merged.xsd

@@ -14,7 +14,7 @@
                     <xs:complexType>
                         <xs:all>
                             <xs:element type="xs:string" name="preview_template" minOccurs="0"/>
-                            <xs:element type="xs:string" name="render_template" minOccurs="0"/>
+                            <xs:element type="xs:string" name="master_template" minOccurs="0"/>
                             <xs:element type="parents" name="parents" minOccurs="0" maxOccurs="1"/>
                             <xs:element type="children" name="children" minOccurs="0" maxOccurs="1"/>
                             <xs:element name="appearances" minOccurs="0" maxOccurs="1">
@@ -25,7 +25,7 @@
                                 </xs:complexType>
                             </xs:element>
                             <xs:element type="additional_data" name="additional_data" minOccurs="0" maxOccurs="1"/>
-                            <xs:element type="xs:string" name="is_visible" minOccurs="0"/>
+                            <xs:element type="xs:string" name="is_system" minOccurs="0"/>
                         </xs:all>
                         <xs:attribute type="xs:string" name="name" use="required"/>
                         <xs:attribute type="xs:string" name="translate" use="required"/>
@@ -60,7 +60,7 @@
         <xs:attribute type="xs:string" name="name" use="required"/>
         <xs:attribute type="xs:boolean" name="default" use="optional"/>
         <xs:attribute type="xs:string" name="preview_template" use="required"/>
-        <xs:attribute type="xs:string" name="render_template" use="required"/>
+        <xs:attribute type="xs:string" name="master_template" use="required"/>
         <xs:attribute type="xs:string" name="reader" use="optional"/>
     </xs:complexType>
     <xs:complexType name="parents">

app/code/Magento/PageBuilder/view/adminhtml/pagebuilder/content_type/banner.xml

@@ -19,7 +19,7 @@
         <appearances>
             <appearance name="collage-left"
                         preview_template="Magento_PageBuilder/content-type/banner/collage-left/preview"
-                        render_template="Magento_PageBuilder/content-type/banner/collage-left/master"
+                        master_template="Magento_PageBuilder/content-type/banner/collage-left/master"
                         reader="Magento_PageBuilder/js/master-format/read/configurable">
                 <elements>
                     <element name="main">
@@ -84,7 +84,7 @@
             </appearance>
             <appearance name="collage-centered"
                         preview_template="Magento_PageBuilder/content-type/banner/collage-centered/preview"
-                        render_template="Magento_PageBuilder/content-type/banner/collage-centered/master"
+                        master_template="Magento_PageBuilder/content-type/banner/collage-centered/master"
                         reader="Magento_PageBuilder/js/master-format/read/configurable">
                 <elements>
                     <element name="main">
@@ -149,7 +149,7 @@
             </appearance>
             <appearance name="collage-right"
                         preview_template="Magento_PageBuilder/content-type/banner/collage-right/preview"
-                        render_template="Magento_PageBuilder/content-type/banner/collage-right/master"
+                        master_template="Magento_PageBuilder/content-type/banner/collage-right/master"
                         reader="Magento_PageBuilder/js/master-format/read/configurable">
                 <elements>
                     <element name="main">
@@ -215,7 +215,7 @@
             <appearance default="true"
                         name="poster"
                         preview_template="Magento_PageBuilder/content-type/banner/poster/preview"
-                        render_template="Magento_PageBuilder/content-type/banner/poster/master"
+                        master_template="Magento_PageBuilder/content-type/banner/poster/master"
                         reader="Magento_PageBuilder/js/master-format/read/configurable">
                 <elements>
                     <element name="main">

app/code/Magento/PageBuilder/view/adminhtml/pagebuilder/content_type/block.xml

@@ -20,7 +20,7 @@
             <appearance default="true"
                         name="default"
                         preview_template="Magento_PageBuilder/content-type/block/default/preview"
-                        render_template="Magento_PageBuilder/content-type/block/default/master"
+                        master_template="Magento_PageBuilder/content-type/block/default/master"
                         reader="Magento_PageBuilder/js/master-format/read/configurable">
                 <elements>
                     <element name="main">

app/code/Magento/PageBuilder/view/adminhtml/pagebuilder/content_type/button_item.xml

@@ -19,12 +19,12 @@
             <parent name="buttons" policy="allow"/>
         </parents>
         <children default_policy="deny"/>
-        <is_visible>false</is_visible>
+        <is_system>false</is_system>
         <appearances>
             <appearance default="true"
                         name="default"
                         preview_template="Magento_PageBuilder/content-type/button-item/default/preview"
-                        render_template="Magento_PageBuilder/content-type/button-item/default/master"
+                        master_template="Magento_PageBuilder/content-type/button-item/default/master"
                         reader="Magento_PageBuilder/js/master-format/read/configurable">
                 <elements>
                     <element name="main">

app/code/Magento/PageBuilder/view/adminhtml/pagebuilder/content_type/buttons.xml

@@ -23,7 +23,7 @@
             <appearance default="true"
                         name="inline"
                         preview_template="Magento_PageBuilder/content-type/buttons/inline/preview"
-                        render_template="Magento_PageBuilder/content-type/buttons/inline/master"
+                        master_template="Magento_PageBuilder/content-type/buttons/inline/master"
                         reader="Magento_PageBuilder/js/master-format/read/configurable">
                 <elements>
                     <element name="main">
@@ -44,7 +44,7 @@
             </appearance>
             <appearance name="stacked"
                         preview_template="Magento_PageBuilder/content-type/buttons/stacked/preview"
-                        render_template="Magento_PageBuilder/content-type/buttons/stacked/master"
+                        master_template="Magento_PageBuilder/content-type/buttons/stacked/master"
                         reader="Magento_PageBuilder/js/master-format/read/configurable">
                 <elements>
                     <element name="main">

app/code/Magento/PageBuilder/view/adminhtml/pagebuilder/content_type/column.xml

@@ -29,7 +29,7 @@
             <appearance default="true"
                         name="full-height"
                         preview_template="Magento_PageBuilder/content-type/column/full-height/preview"
-                        render_template="Magento_PageBuilder/content-type/column/full-height/master"
+                        master_template="Magento_PageBuilder/content-type/column/full-height/master"
                         reader="Magento_PageBuilder/js/master-format/read/configurable">
                 <elements>
                     <element name="main">
@@ -77,7 +77,7 @@
             </appearance>
             <appearance name="align-top"
                         preview_template="Magento_PageBuilder/content-type/column/full-height/preview"
-                        render_template="Magento_PageBuilder/content-type/column/full-height/master"
+                        master_template="Magento_PageBuilder/content-type/column/full-height/master"
                         reader="Magento_PageBuilder/js/master-format/read/configurable">
                 <elements>
                     <element name="main">
@@ -125,7 +125,7 @@
             </appearance>
             <appearance name="align-center"
                         preview_template="Magento_PageBuilder/content-type/column/full-height/preview"
-                        render_template="Magento_PageBuilder/content-type/column/full-height/master"
+                        master_template="Magento_PageBuilder/content-type/column/full-height/master"
                         reader="Magento_PageBuilder/js/master-format/read/configurable">
                 <elements>
                     <element name="main">
@@ -173,7 +173,7 @@
             </appearance>
             <appearance name="align-bottom"
                         preview_template="Magento_PageBuilder/content-type/column/full-height/preview"
-                        render_template="Magento_PageBuilder/content-type/column/full-height/master"
+                        master_template="Magento_PageBuilder/content-type/column/full-height/master"
                         reader="Magento_PageBuilder/js/master-format/read/configurable">
                 <elements>
                     <element name="main">

app/code/Magento/PageBuilder/view/adminhtml/pagebuilder/content_type/column_group.xml

@@ -23,12 +23,12 @@
         <children default_policy="deny">
             <child name="column" policy="allow"/>
         </children>
-        <is_visible>false</is_visible>
+        <is_system>false</is_system>
         <appearances>
             <appearance default="true"
                         name="default"
                         preview_template="Magento_PageBuilder/content-type/column-group/default/preview"
-                        render_template="Magento_PageBuilder/content-type/column-group/default/master"
+                        master_template="Magento_PageBuilder/content-type/column-group/default/master"
                         reader="Magento_PageBuilder/js/master-format/read/configurable">
                 <elements>
                     <element name="main">