[Feature Request] Browse library by 'Album Artist'

[Shados]

Currently, you can browse the MPD library by Artist, but I'd prefer to optionally be able to browse by the Album Artist (if set, with a fallback to Artist if not).

[pedrolucasp]

I want to get down to this, @yktoo, mind giving me any pointers?

[yktoo]

@pedrolucasp We can add a new folder providing categorization on Album Artist here:

I expect the implementation to be pretty much the same as for the Artist. It will also need two more elements in libpath.go for albumartists and albumartist, as well as corresponding structs.