Make it possible to disable cross-sell on cart page

To be able to select whether to have the cross-sell active on the cart
page an admin configuration is created under Stores > Configuration >
Sales > Checkout > Shopping Cart.

The default for this setting is set to Yes (Show cross-sell items). This
is for backwards compatibility and not have webshop owners accidentally
not showing these items.

Because this is now sorted as the 3rd configuration in this
section/group the extra configurations for the grouped product image and
the configurable product image are now also increased.

This feature will make it possible to have this cross-sell turned off
during special sales, A/B testing or in a specific store view.

Author: arnoudhgz

app/code/Magento/Checkout/etc/adminhtml/system.xml

@@ -41,6 +41,10 @@
                 <field id="number_items_to_display_pager" translate="label" type="text" sortOrder="2" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Number of Items to Display Pager</label>
                 </field>
+                <field id="crosssell_enabled" translate="label" type="select" sortOrder="3" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
+                    <label>Show Cross-sell Items in the Shopping Cart</label>
+                    <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
+                </field>
             </group>
             <group id="cart_link" translate="label" sortOrder="3" showInDefault="1" showInWebsite="1" showInStore="0">
                 <label>My Cart Link</label>

app/code/Magento/Checkout/etc/config.xml

@@ -17,6 +17,7 @@
                 <delete_quote_after>30</delete_quote_after>
                 <redirect_to_cart>0</redirect_to_cart>
                 <number_items_to_display_pager>20</number_items_to_display_pager>
+                <crosssell_enabled>1</crosssell_enabled>
             </cart>
             <cart_link>
                 <use_qty>1</use_qty>

app/code/Magento/Checkout/i18n/en_US.csv

@@ -176,4 +176,5 @@ Payment,Payment
 "Not yet calculated","Not yet calculated"
 "We received your order!","We received your order!"
 "Thank you for your purchase!","Thank you for your purchase!"
-"Password", "Password"
+Password,Password
+"Show Cross-sell Items in the Shopping Cart","Show Cross-sell Items in the Shopping Cart"

app/code/Magento/Checkout/view/frontend/layout/checkout_cart_index.xml

@@ -186,7 +186,7 @@
                         </block>
                         <container name="checkout.cart.widget" as="checkout_cart_widget" label="Shopping Cart Items After"/>
                     </container>
-                    <block class="Magento\Checkout\Block\Cart\Crosssell" name="checkout.cart.crosssell" template="Magento_Catalog::product/list/items.phtml" after="-">
+                    <block class="Magento\Checkout\Block\Cart\Crosssell" name="checkout.cart.crosssell" template="Magento_Catalog::product/list/items.phtml" after="-" ifconfig="checkout/cart/crosssell_enabled">
                         <arguments>
                             <argument name="type" xsi:type="string">crosssell</argument>
                         </arguments>

app/code/Magento/ConfigurableProduct/etc/adminhtml/system.xml

@@ -9,7 +9,7 @@
     <system>
         <section id="checkout">
             <group id="cart">
-                <field id="configurable_product_image" translate="label" type="select" sortOrder="4" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
+                <field id="configurable_product_image" translate="label" type="select" sortOrder="5" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Configurable Product Image</label>
                     <source_model>Magento\Catalog\Model\Config\Source\Product\Thumbnail</source_model>
                 </field>

app/code/Magento/GroupedProduct/etc/adminhtml/system.xml

@@ -9,7 +9,7 @@
     <system>
         <section id="checkout" translate="label" type="text" sortOrder="305" showInDefault="1" showInWebsite="1" showInStore="1">
             <group id="cart" translate="label" sortOrder="2" showInDefault="1" showInWebsite="1" showInStore="1">
-                <field id="grouped_product_image" translate="label" type="select" sortOrder="3" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
+                <field id="grouped_product_image" translate="label" type="select" sortOrder="4" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Grouped Product Image</label>
                     <source_model>Magento\Catalog\Model\Config\Source\Product\Thumbnail</source_model>
                 </field>