* add disc field to songs table via migration
* add disc field to song model
* collect disc information in file sync process
* sort song list by disc and track number in album context
* check the disc field in file test
* remove nullable flag from disc field in add_disc_into_songs migration
* fix php code style issues
* fix js code style
* fix sort usage in song-list
* sort songs by inserting into queue by clicking the album/artist item play button (album_id, disc, track)
* add disc to sync tags in media model
Koel can now integrate and use the rich information from Last.fm. Now
whenever a song is played, its album and artist information will be
queried from Last.fm and cached for later use. What's better, if an
album has no cover, Koel will try to update its cover if one is found on
Last.fm.
In order to use this feature, users only need to provide valid Last.fm
API credentials (namely LASTFM_API_KEY and LASTFM_API_SECRET) in .env. A
npm and gulp rebuild is also required - just like with every update.
