Add col for listening progress tracking

[hawkeyexl]

Tracking listening progress, both at an album level and at a track level, is important for serving long-form audio files such as audiobooks and podcasts. Please add this to your tracker.

The following software says that it tracks listening progress, though I haven't been able to personally confirm:

• Booksonic-Air (there's a linuxserver.io docker container)
• Audioserve

[basings]

thx @hawkeyexl !

that's a great feature for audiobooks and podcasts, but is it for music?

I'd be happy to include them if someone makes a PR! I added issues for them #86 #87 #88

[basings]

This is the "bookmarks" feature of the client substreamer