OBS Multiplatform 0.13.1 Release Candidate 1

Changes:
* Fixed a case where audio would completely stop playing from certain sources
* Fixed a case where audio for certain sources would go out of sync
* Fixed multiple cases where buffering would increase unnecessarily
* Fixed an issue where outputs could potentially start up out of sync
* Fixed an issue where multi-track outputs would take many seconds to start up
* Fixed a bug where multi-track audio outputs would potentially not be in sync
* Fixed a bug with the output (program) view in studio mode where it would not update its resolution when resolution settings have been changed
* Fixed a bug (that has been around since before 0.13.0) where if you start a secondary output with already-active encoders, it could go out of sync if started very shortly after the first output.  Secondary outputs started with already active encoders will now always be in sync
* Fixed a crash that could happen when transitioning under certain circumstances
* Fixed the "del" button not working on scenes/sources
