Driftfin build-57

Changes:

• New Video quality setting in Settings > Playback: Auto drops the quality when the network struggles instead of buffering, and picks back up where the show was. Fixed choices (1080p, 720p, 480p) cap every playback and apply the next time you play something.

Automated build. Unit tests ran in CI, but this build was not run on a TV by CI. Known limits are listed in the README.