Stop video playback while in loop

If you use the custom video player example/roimagecanvas, then when the video is finished it gives a isfullresult message and the screen doesn't close. You can also use player.stop to stop the video at any time. Pause takes about 5 seconds to return to the event loop, and resume appears to be instant. I'm not sure what the cause of that delay is, but by merging code into the status notification and/or event loop you can have control on a per second basis without using a facade screen.