when one change the current scene, menu controllable system update current button to use

sources/Models/GameState.hpp

@@ -14,6 +14,7 @@ namespace BBM
 	//! @brief A class representing the current game state. This allow one to retain information between update calls.
 	class GameState
 	{
+		public:
 		//! @brief The list of scenes available.
 		enum SceneID
 		{
@@ -27,9 +28,12 @@ namespace BBM
 
 
 		//! @brief The currently loaded scene
-		SceneID currentScene = MainMenuScene;
+		SceneID currentScene = TitleScreenScene;
+
+		//! @brief The next scene to load (if smae as currentScene, nothing to do)
+		SceneID nextScene = TitleScreenScene;
 
 		//! @brief The list of loaded scenes.
-		std::unordered_map<SceneID, WAL::Scene> _loadedScenes = {};
+		std::unordered_map<SceneID, std::shared_ptr<WAL::Scene>> _loadedScenes = {};
 	};
 }