some refactoring

hopefully improved rendering speed
added support to add .obj obstacles

params/ToolBoxWidget.h

@@ -42,6 +42,7 @@ private:
 	QPushButton* btnWall;
 	QPushButton* btnPillar;
 	QPushButton* btnDoor;
+	QPushButton* btnObject;
 	QPushButton* btnStair;
 	QPushButton* btnElevator;
 
@@ -64,6 +65,7 @@ private slots:
 	void onNewWall();
 	void onNewPillar();
 	void onNewDoor();
+	void onNewObject();
 	void onNewStair();
 	void onNewElevator();
 
@@ -71,7 +73,7 @@ private slots:
 	void onNewBeacon();
 	void onNewFingerprintLocation();
 	void onNewPOI();
-    void onNewGTP();
+	void onNewGTP();
 
 	void onNewImage();