Album's Credits

[ebb-earl-co]

Up to this point, there has been track.Track.get_credits(), fetching data from TIDAL's API endpoint /track//credits. This pull request adds an analogous method to album.Album: album.Album.set_album_credits().

• Obviously, album.py incorporates this change
• requesting.py
• In media.py, VideoFormat has been moved to video.py, as it is used nowhere else and af_aq dictionary has been moved to track.py as it is similarly used nowhere else
• Docstrings are added to mix.py
• The new class AlbumsCreditsResponseJSON is added to models.py. It is almost identical to TracksCreditsResponseJSON
• Optional typing added to oauth.py
• Docstrings and a bit of logging are added to playlist.py
• A new function, request_albums_credits, is added to requesting.py, almost identical to requesting.request_credits()
• Add docstrings and rename methods in track.py
• The class VideoFormat now lives in video.py
• Separately, login.py now executes login_android() automatically if the android-tidal.token file exists. This obviates the need to interact with the user prompt every time that HiRes or Sony 360 Reality Audio is specified as the audio format.

[ebb-earl-co]

Another change, and this one a long time coming: in requesting.py, the argument identifier that was common to all requesting.request_* functions are renamed to the specific identifier required. E.g. in requesting.request_albums(), it takes album_id: int as an argument instead of the generic identifier.