MAG520/522/522v2/524 2.20.11 Release Notes

System:
- Reworked MRC pairing record saving to eliminate deadlock error when trying to activate the test
- Authorization data is not deleted on external portals after Clear data

Playback:
- Fixed: Sound doesn't work on streams and files with MPGA
- Fixed: Playback stops after 1 minute on RTP streams
- Minor improvements to playback handling and display