Tzlocal

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- Returning pytz_deprecation_shim zones to lower the surprise for pytz users.

- The Windows OS environment variable 'TZ' will allow an override for
setting the timezone. The override timezone will be asserted for
timezone validity bit not compared against the systems timezone offset.
This allows for overriding the timezone when running tests.

- Dropped support for Windows 2000, XP and Vista, supports Windows 7, 8 and 10.

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- Big refactor; Implemented get_localzone_name() functions.

- Adding a Windows OS environment variable 'TZ' will allow an override for
setting the timezone (also see 4.0b3).

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- Now finds and compares all the configs (under Unix-like systems) and
tells you what files it found and how they conflict. This should make
it a lot easier to figure out what goes wrong.

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- Modernized the packaging, moving to setup.cfg etc.

- Handles if the text config files incorrectly is a TZ file. (revanSZ)

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- Dropped Python 2 support
- Switched timezone provider from pytz to zoneinfo (PEP 615)

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- No changes.