Refactoring Keyword mapping, introducing tuples

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

@@ -482,7 +482,7 @@ begin
             end;
         end;
 
-        Result := TDataValue.FromGenericRecord(TKeywordMapping<TDataValue>.Create(recFields.ToArray));
+        Result := TDataValue.FromGenericRecord(TGenericRecord<TDataValue>.Create(recFields.ToArray));
     finally
         recFields.Free;
     end;