- Add `FLAC_FLAC` (16), `FLAC_FLAC_24BIT` (22) format codes (based on librespot-org/librespot#796, librespot-org/librespot#1424) - Regenerate Metadata_pb2.py with protoc 3.20.1 - Add enums: `SuperAudioFormat.FLAC`, `AudioQuality.LOSSLESS` - Refactor to generic DRY `FormatOnlyAudioQuality` base class while maintaining existing `VorbisOnlyAudioQuality` as wrapper - Remove `AAC_24_NORM` (replaced by `FLAC_FLAC` at code 16)