Convert Green button styling into a reference

Author: bclothier

Rubberduck.Core/UI/About/AboutControl.xaml

@@ -52,7 +52,7 @@
                 <Style.Setters>
                     <Setter Property="Margin" Value="10" />
                     <Setter Property="CornerRadius" Value="6" />
-                    <Setter Property="BorderBrush" Value="Green" />
+                    <Setter Property="BorderBrush" Value="{StaticResource GreenButtonBorderBrush}" />
                     <Setter Property="BorderThickness" Value="2" />
                     <Setter Property="Background" Value="{StaticResource GreenButtonBrush}" />
                 </Style.Setters>

Rubberduck.Core/UI/Styles/DefaultStyle.xaml

@@ -26,6 +26,7 @@
     <Color x:Key="SoftBackgroundColor">#FFF8F8FF</Color>
     <Color x:Key="DropShadowColor">#71000000</Color>
     <Color x:Key="GreenButtonColor">#FF40C954</Color>
+    <Color x:Key="GreenButtonBorderColor">#FF008000</Color>
     <Color x:Key="GreenButtonMouseOverColor">#FF61D156</Color>
     <Color x:Key="HighlightBorderColor">#80DADADA</Color>
     <Color x:Key="HighlightBackgroundColor">#210080FF</Color>
@@ -48,6 +49,7 @@
     <SolidColorBrush x:Key="GlyphPanelBorderBrush" Color="{StaticResource GlyphPanelBorderColor}"/>
     <SolidColorBrush x:Key="SoftBackgroundBrush" Color="{StaticResource SoftBackgroundColor}"/>
     <SolidColorBrush x:Key="GreenButtonBrush" Color="{StaticResource GreenButtonColor}"/>
+    <SolidColorBrush x:Key="GreenButtonBorderBrush" Color="{StaticResource GreenButtonBorderColor}"/>
     <SolidColorBrush x:Key="GreenButtonMouseOverBrush" Color="{StaticResource GreenButtonMouseOverColor}"/>
     <SolidColorBrush x:Key="HighlightBorderBrush" Color="{StaticResource HighlightBorderColor}"/>
     <SolidColorBrush x:Key="HighlightBackgroundBrush" Color="{StaticResource HighlightBackgroundColor}"/>