Audio controls in OBS Mixer and Advanced Audio Properties window are not
sorted at all. Every time OBS is restarted they get shuffled (Jim note:
This is due to json object hashing). The order of these controls is
additionally not consistent between the mixer and the advanced audio
properties window.
Closesobsproject/obs-studio#1242
This adds close buttons to remux dialog, output timer dialog, and
advanced audio properties dialog. I also did a small refactor of the
remux dialog so the buttons were consistent with other dialogs.
Closesjp9000/obs-studio#876
