* tsmf audio volume fixes
* The first audio volume message is received before everything is
initialized. Cache this data until we're ready.
* Handle the cases of gstreamer unitialized/partially ready/
fully ready.
* Default to 50% as a fallback if the above fails.
* Improved detection of the primary monitor.
* Fix an unexpected shutdown when the server asks us to resize the media
overlay to (width=0,height=0).
* Permit multiple presentations - required for repeat of audio files
and also is seen in some video cases.
* Several leak fixes.
* Fix logging related compile warnings and other usage of PRIu64.
