fix #541: Allow configuring color for interfaces (etc.) in C# semantic highlighting

Author: siegfriedpammer

src/AddIns/BackendBindings/CSharpBinding/Project/Resources/CSharp-Semantic.xshd

@@ -32,7 +32,11 @@
 
 	<!-- Colors used for semantic highlighting -->
 	<Color name="ReferenceTypes" foreground="#004085" exampleText="System.#{#Uri#}# uri;"/>
+	<Color name="InterfaceTypes" foreground="#004085" exampleText="System.#{#IDisposable#}# obj;"/>
+	<Color name="TypeParameters" foreground="#004085" exampleText="class MyList&lt;#{#T#}#&gt; { }"/>
+	<Color name="DelegateTypes" foreground="#004085" exampleText="System.#{#Action#}#; action;"/>
 	<Color name="ValueTypes" fontWeight="bold" foreground="#004085" exampleText="System.#{#DateTime#}# date;"/>
+	<Color name="EnumTypes" fontWeight="bold" foreground="#004085" exampleText="System.#{#ConsoleKey#}# key;"/>
 	<Color name="MethodCall" foreground="MidnightBlue" fontWeight="bold" exampleText="o.#{#ToString#}#();"/>
 	<Color name="FieldAccess" fontStyle="italic" exampleText="return this.#{#name#}#;"/>
 	<Color name="InactiveCode" foreground="Gray" exampleText="#{#Deactivated by #if#}#"/>

src/AddIns/BackendBindings/CSharpBinding/Project/Src/CSharpSemanticHighlighterVisitor.cs

@@ -58,10 +58,10 @@ public CSharpSemanticHighlighterVisitor(CSharpSemanticHighlighter highlighter, I
 			//this.defaultTextColor = ???;
 			this.referenceTypeColor = highlighting.GetNamedColor("ReferenceTypes");
 			this.valueTypeColor = highlighting.GetNamedColor("ValueTypes");
-			this.interfaceTypeColor = this.referenceTypeColor;
-			this.enumerationTypeColor = this.valueKeywordColor;
-			this.typeParameterTypeColor = this.referenceTypeColor;
-			this.delegateTypeColor = this.referenceTypeColor;
+			this.interfaceTypeColor = highlighting.GetNamedColor("InterfaceTypes");
+			this.enumerationTypeColor = highlighting.GetNamedColor("EnumTypes");
+			this.typeParameterTypeColor = highlighting.GetNamedColor("TypeParameters");
+			this.delegateTypeColor = highlighting.GetNamedColor("DelegateType");
 			this.methodDeclarationColor = this.methodCallColor = highlighting.GetNamedColor("MethodCall");
 			//this.eventDeclarationColor = this.eventAccessColor = defaultTextColor;
 			//this.propertyDeclarationColor = this.propertyAccessColor = defaultTextColor;