performance enhancements

memory enhancements
prevent starting sensors more than once
fix for wifi lag issues
map scaling for huge buildings

ui/map/3D/MapView3D.h

@@ -140,6 +140,8 @@ public:
 
 	void toggleRenderMode();
 
+	void setVisible(bool visible) override;
+
 public slots:
 
 	void mousePressEvent(QMouseEvent*);