reset() {
		// point to the current active stage "default" camera
		let current = state.get();
		if (typeof current !== "undefined") {
			this.viewport = current.cameras.get("default");
		}

		// publish reset notification
		eventEmitter.emit(GAME_RESET);

		// Refresh internal variables for framerate  limiting
		this.updateFrameRate();
	}
reset the game Object manager
destroy all current objects