performance enhancements

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

nav/NavController.h

@@ -336,7 +336,7 @@ private:
 	}
 
 
-	const int display_ms = Settings::MapView::msPerFrame.ms();
+	const int display_ms = Settings::MapView3D::msPerFrame.ms();
 
 	/** UI update loop */
 	void updateMapViewLoop() {