Added ability to mute Mac audio.
Fixed various issues with Mac camera grabber: crashes, memory leak, start up speed.
Fix of trace log module
Fixed scaling mode when spooling out YUV file as video.
Fixed "Tones" audio pseudo-device being Recorder.
Make sure have correct error group when get timeout talking to sound channel.
Prevent infinite wait on direct sound recording. Get error if longer than expected.
Added trace log for starting Mac audio