Rotating steering wheel in onroad UI

Added toggle to rotate the steering wheel in the top right corner of the onroad UI.

selfdrive/ui/qt/onroad.h

@@ -83,6 +83,8 @@ private:
 
   std::map<int, QPixmap> wheelImages;
 
+  bool rotatingWheel;
+  int steeringAngleDeg;
   int wheelIcon;
   int y_offset;
 };