added "new map" button

fixed minor model/logic issues

params/ActionWidget.h

@@ -13,10 +13,15 @@ public:
 
 signals:
 
+	/** request: load a map */
 	void onLoad();
 
+	/** request: save a map */
 	void onSave();
 
+	/** request: new map */
+	void onNew();
+
 public slots:
 
 };