OBS Multiplatform 0.9.1

Changes:
* Fixed a memory leak that could occur with async (video/media) sources under certain circumstances
* Fixed an issue where video frame cache would grow with no upper limit; now frees data after it becomes unused after a specific amount of time
* Fixed a bug with advanced output mode where service-enforced settings would be applied to all audio encoders rather than the audio encoder that was assigned to the stream
