Many tweaks and fixes relating to AngelScript, implements shininess.

src/AngelScript/AngelScriptTypeInfo.hpp

@@ -26,7 +26,9 @@ public:
             return find->second;
         }
         auto func = _type->GetMethodByName(functionName.c_str());
-        func->AddRef();
+        if (func != nullptr){
+            func->AddRef();
+        }
         _functions.insert({functionName, func});
         return func;
     }