[496069] Add support for images in the buttons and widget actions Bug: 496069 Change-Id: I61c6f72a7ab8b233f9841894c66658863e52f5c2 Signed-off-by: Axel Richard <axel.richard@obeo.fr> Signed-off-by: Mélanie Bats <melanie.bats@obeo.fr>