ImageWidget: add method setOpacity(opacity)
ImageWidget: add method setOpacity(opacity)

mitdrc/director,openhumanoids/director,manuelli/director,openhumanoids/director,patmarion/director,patmarion/director,RobotLocomotion/director,mitdrc/director,manuelli/director,openhumanoids/director,manuelli/director,RobotLocomotion/director,manuelli/director,patmarion/director,RobotLocomotion/director,openhumanoids/director,RobotLocomotion/director,patmarion/director,mitdrc/director,manuelli/director,RobotLocomotion/director,mitdrc/director,patmarion/director,mitdrc/director,openhumanoids/director