Refactoring Keyword mapping, introducing tuples

Test/AST/Test.Myc.Ast.RTL.TypeRegistry.pas

@@ -315,7 +315,7 @@ begin
     idx := genRec.IndexOf(Myc.Data.Keyword.TKeywordRegistry.Intern('Add'));
     Assert.IsTrue(idx >= 0, 'Method Add should exist in type definition');
 
-    methodType := genRec.Items[idx].Value;
+    methodType := genRec.Items[idx];
     Assert.AreEqual(TStaticTypeKind.stMethod, methodType.Kind);
     // Add has 2 args (Ordinal, Ordinal) -> Ordinal
     Assert.AreEqual(Int64(2), Length(methodType.Signatures[0].ParamTypes));