beets: remove Flask's python_abis since it doesn't actually specify any
discogs_client: initial exheres, oauth2: initial exheres
beets: add discogs_client dependency
oauth2: fix exheres name
discogs_client: change name to be consistent with pypi package name
discogs_client, oauth2: remove python 3
beets: essentially ready to be unmasked for testing, dependencies are correct
and all needed stuff is written. the only thing holding me back from doing so
is that i'm still waiting on nico's python packages he wrote to be accepted
into ::python and ::media-unofficial.

pyacoustid: initial exheres
beets: add pyacoustid dependency