Remove fetching acoustid/MusicBrainz metadata

Update send_file call args

Allow multiple requests for random requests

/api/request/random?q=<terms>&num=<number of songs>

Remove terms from path in random requests

/api/request/random/<terms> becomes /api/request/random?q=<terms>

Remove /api/request/favorite/<username>

Use /api/request/random with a search string of fav:<username> instead.

Remove search with terms in path

fakekawa: Support requesting

Update API with song context

Makes the previous commit work from the API

Add variables for current artist/album

Fix typo in unlist API

Fix request favorite username case

Fix error when fallback is played

Or when any other song without id is played

Fix username case sensitivity wrt favorites

Fix history JSON

Add taggings primary key

Fix favorites

Improve search performance for tags/favs

Replacing the use of HAVING with WHERE massively improves performance
with many tags/favs because HAVING filters at the very end and has to
build a complete rendering on the database first. Filtering there is the
slowest part because it needs to filter everything without any indexes.

Add indexes on taggings and favorites

to improve performance with lots of tags/favorites

Fix favoriting now playing

Fix adding/removing favorites