Mario: add turtle enemy

mario/main.cpp

@@ -371,6 +371,7 @@ SceneStruct mainGameScene(const std::string &level_path) {
     moving_objects.push_back(mario);
     std::unordered_set<int> moving_object_ids = {
         GOOMBA_ID,
+        TURTLE_ID,
     };
     for (auto &obj : scene->getObjects(moving_object_ids)) {
         moving_objects.push_back(std::dynamic_pointer_cast<MarioBlock>(obj));