constructor(app = game) {
		/**
		 * define the minimum required version of melonJS<br>
		 * this can be overridden by the plugin
		 */
		this.version = version;

		/**
		 * a reference to the app/game that registered this plugin
		 * @type {Application}
		 */
		this.app = app;
	}
@param {Application} [app] - a reference to the app/game that registered this plugin