Steering wheel icons

Added toggle for select steering wheel icons in the onroad UI.

Want to add your own steering wheel? Request one under "feature-requests" on the FrogPilot Discord!

selfdrive/ui/qt/onroad.h

@@ -78,8 +78,11 @@ private:
   // FrogPilot variables
   UIScene &scene;
 
+  std::map<int, QPixmap> wheelImages;
+
   bool rotatingWheel;
   int steeringAngleDeg;
+  int wheelIcon;
   int y_offset;
 };