* use newer string formatters (https://pyformat.info)
* fix typo
* went through the files again, additions from #1165 are also included
* replace .format() with f strings
Removed the `client_credentials_manager` and `oauth_manager` parameters because they are redundant.
Replaced the `set_auth` and `auth_manager` properties with standard attributes.
Removed the following deprecated methods from `Spotify`:
* `playlist_tracks`
* `user_playlist`
* `user_playlist_tracks`
* `user_playlist_change_details`
* `user_playlist_unfollow`
* `user_playlist_add_tracks`
* `user_playlist_replace_tracks`
* `user_playlist_reorder_tracks`
* `user_playlist_remove_all_occurrences_of_tracks`
* `user_playlist_remove_specific_occurrences_of_tracks`
* `user_playlist_follow_playlist`
* `user_playlist_is_following`
Removed the deprecated `as_dict` parameter from the `get_access_token` method of `SpotifyOAuth` and `SpotifyPKCE`.
Removed the deprecated `get_cached_token` and `_save_token_info` methods of `SpotifyOAuth` and `SpotifyPKCE`.
Removed `SpotifyImplicitGrant`.
Removed `prompt_for_user_token`.
