added nav-mesh support to indoor-map

some fixes/changes

MainWindow.h

@@ -40,8 +40,9 @@ public:
 signals:
 
 	void onShow2D();
-	void onShow3DFloorplan();
-	void onShow3DGrid();
+	void onShow3DFloorplan(bool show);
+	void onShow3DGrid(bool show);
+	void onShow3DNavMesh(bool show);
 	void onGridShowEdges(bool);
 	void onGridNodeColorImp();
 	void onGridNodeColorType();