Tzlocal

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- Nothing changed yet.

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- Added a pre-commit config

- Updated python versions [hugovk]

- Added type hints for the public functions

- Moved to using pyproject.toml for project config.

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- The Unicode data doesn't change tz names when IANA does, so what is current
in IANA is treated as an alias in Unicode data. This version handles that.

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- The logging info under windows made it look like it looked up the registry
info even when you had a TZ environment, but it doesn't actually do that.

- Improved the handling of loggers.

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- Fixed a bug in the new assert_tz_offset method.

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- Change how the system offset is calculated to deal with non-DST
temporary changes, such as Ramadan time in Morocco.

- Change the default to only warn when the timezone offset and system
offset disagree (but still not even warn if TZ is set)

- Add the assert_tz_offset() method to the top level for those who want
to explicitly check and fail.