Changed EnableMvcSupport config section and classes to be: DefaultRenderingEngine which uses an enum.

Added a real handy Enum<T> class for parsing/traversing enums.

src/Umbraco.Core/RenderingEngine.cs

@@ -0,0 +1,8 @@
+namespace Umbraco.Core
+{
+	public enum RenderingEngine
+	{
+		Mvc,
+		WebForms
+	}
+}