Reworks setting script owner to something a lot more clean

tests/ScriptTests/ScriptOwnerTest.cpp

@@ -13,6 +13,7 @@ static std::unordered_map<const char*, const char*> _scripts =
         void Test(){
             auto mon = cast<Pokemon@>(GetOwner());
             if (mon is null){
+                print("mon was null");
                 throw("Owner was null!");
             }
         }