* redo now playing indicator
- instead of drawing an arrow overlay, add an offset green shadow
* do not show "Connection Terminated" on code 0
if an application quits successfully because it was asked to do so by
the user (errorCode = 0), then do not display an alert -- just go back
to the prior view.
* fix: add missing toggle for mutli-controller support
on tvOS (maybe also on other cases where you're using a "real" gamepad?),
use GCEventViewController so the system-level "back" event doesn't quit
the stream