Player config UI rethink

[fluffy-critter]

It’s getting overly complicated to try to support different player options from a modular interface and theme options will be pretty universal across players, probably.

so let’s have a row of theme colors (and a player selector if that ever happens), and a “custom css” file selector field, which should cover all the bases. Don’t overcomplicate without a specific use case.

it’s still good to namespace player theme stuff but plop that into a generic “player” section rather than making it per-player.

[fluffy-critter]

Feedback from a user indicates that it isn't super obvious that the per-track metadata just overrides album metadata and doesn't need to be set on an individual basis except for exceptions. Maybe say "track genre" "track composer" etc. (like how "track artist" is already)

The whole top "album metadata" section is a mess right now and could probably be put into the track selector similarly to how Bandcamp does it.

"Build options" could probably be laid out better as well, as it isn't super clear what each of the options actually does or how they interact.