Issue: https://github.com/jellyfin/jellyfin/issues/6450
Enable DirectPlay responses
Rewrite DirectPlay and DirectStream resolution
Prefer copy transcode video codec options
Enhance condition processor
Support DirectStream and Transcode with parity
Rework audio stream selection and add tests for ExternalAudio
Update MediaInfoHelper to only call StreamBuilder once
* Use Guid.Equals(Guid) instead of the == override
* Ban the usage of Guid.Equals(Object) to prevent accidental boxing
* Compare to default(Guid) instead of Guid.Empty