Yfpy

Release updates:

* Switch YFPY to use environment variables, .env files, and programmatic arguments for authentication and token management instead of using private JSON files.
* Switch documentation generation to MkDocs from Sphinx
* Update README.md
* Update/improve code docstrings
* Support Python 3.12 and deprecate Python 3.8 and Python 3.9

Release updates:

* Update documentation
* Update README.md
* Update `quickstart.py`
* Update query to force inclusion of game_code to avoid errors
* Support for transactions that include FAAB and/or draft picks
* Add support for usage in Docker

Release updates:

* Update documentation
* Update test configuration
* Update `quickstart.py`
* Update queries and custom classes to return flattened objects without unnecessary single-key dict access, closes 32
* Fix type hints to support flattened return values

Release updates:

* Update documentation
* Update dependencies
* Improve and update type hints
* Improve type casting for values based on the data (numeric objects that could be `0` are set to `None` when they don't exist, numeric objects that are cumulative/counters are set to `0` when they don't exist, `int`s and `float`s are properly cast, etc.)

Release updates:

* Update documentation
* Update dependencies
* Add utility to detect missing Yahoo Fantasy Sports API data fields
* Add missing Yahoo Fantasy Sports API data fields wherever detected
* Add support for running `yahoo_query.get_player_stats_for_season`, `yahoo_query.get_player_stats_by_week`, and `yahoo_query.get_player_stats_by_date` with `limit_to_league_stats=False` so that *all* player stats can be retrieved (does not limit the player stats to those applicable to a specific league context)

Release updates:

* Update documentation
* Update dependencies
* Deprecate Python v3.7
* Add support for Python v3.11