* Recognize ".m4b" as an audio-book format
- Has the resolver recognize the ".m4b" format as book
- Jellyfin reverts to seeing the file as a music file without this check
* Recognize ".m4a", ".aac", ".flac", and ".mp3" as an audio-book formats
- All the formats supported in the docs will now be marked as type "Book"
* Add ".opus" as a supported Audiobook format
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Co-authored-by: Louis Sandoval <louis@sandoval.family>