Merge pull request #72 from philipcass/patch-4

Set abstract base method declarations as virtual

Author: jacksondunstan

Diff for: Unity/Assets/NativeScript/Editor/GenerateBindings.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.IO;
@@ -4163,7 +4163,8 @@ static void AppendMethod(
 				AppendCppMethodDeclaration(
 					cppMethodName,
 					enclosingTypeIsStatic,
-					false,
+					// Mark as virtual if method/class is not static or generic
+					cppMethodIsStatic || enclosingTypeIsStatic || methodTypeParams != null? false : true,
 					cppMethodIsStatic,
 					cppReturnType,
 					methodTypeParams,