Reference frame invalidation seems to trigger a renderer hang on tvOS 14.5 in my testing.
Since we don't have RFI to bias us toward H.264, let's use HEVC all the time now.
This may change again if the RFI issues are sorted out (perhaps we need to implement
blocking waits for invalidated frames?)
* 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
