More standard pointers.

src/dawn/prefab/SceneItemPrefab.hpp

@@ -22,7 +22,9 @@ namespace Dawn {
        */
       static O * prefabCreate(Scene *scene) {
         O *item = scene->createSceneItemOfType<O>();
-        item->prefabInit(&scene->game->assetManager);
+        auto game = scene->game.lock();
+        assertNotNull(game, "Game cannot be null!");
+        item->prefabInit(&game->assetManager);
         return item;
       }
 
@@ -32,7 +34,7 @@ namespace Dawn {
        * @param scene Scene that this prefab belongs to.
        * @param id ID of this scene item.
        */
-      SceneItemPrefab(Scene *scene, sceneitemid_t id) :
+      SceneItemPrefab(std::weak_ptr<Scene> scene, sceneitemid_t id) :
         SceneItem(scene, id)
       {
       }