* Added icons to the controller.
* Keep the car within the scene.
* Removed the ui file because 4 buttons can be maintained in code easier.
Change-Id: I10af821beb442939e1e7fbdd3ffbde67a272bb2f
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 29a4323974a1877faf389637be40688e3bc1790d)