Add Windows support using win32timezone

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Add a localize function, which either adds the local timezone to a naive datetime or converts a non-naive datetime to the local timezone

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Correct typo

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Always use pytz timezones

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All pytz timezones use localize

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Optimize comparisons between timezones. Use common timezones as priority over others. If multiple matches are found to `/etc/localtime`, warn, but still use the first one.

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Add a utility function to strip timezone info from a datetime See #3603

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Add support for looking up non-English time zone names to the windows names, then checking Olsen database. Also, raise a better error if this fails. See #3811

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Moved `win32timezones` into a separate file, and added code that actually generates this file (which can be used to keep up to date; not called by default). See #3811

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Added method for calculating local timezone name, for use as a default column value setter

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Use `Std` rather than `Index` to map the time zone names, and make sure we use the `standardName`. This is tested on an hactual Japanese machine. See #3811 (Also fix the spelling ''Olsen''`->`''Olson'')

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When we localize, make sure we always return a datetime_tz for consistency

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Removed lots of extraneous print statements or converted them to logging calls. Removed `add_available_sites` call from `AdminApp` which was never used and only prints out arguments

(cherry picked from commit ea03ebc8d75c62edadf23fc2241491a7926eb55e)

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Handle skipping `__rsub__` on pypy. See #5760

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Replace all except Exception, e with except Exception as e

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Switch to calling the `kernel32` methods ourselves, and use `GetDynamicTimeZoneInformation` if possible. See #5858

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If the key name is returned (i.e. we have `GetDynamicTimeZoneInformation`), then use that directly instead of looking up the index. Name the variable more appropriately too. See #5858

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Added `ctypes` structures necessary to call the `GetDynamicTimeZoneInformation` not present in `win32timezones` - see #5858

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Add `VirtualTime` implementation that currently patches `time.time`, `datetime.datetime.now/utcnow` and the equivalent `datetime_tz` functions. See #6165

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Sort out the `datetime_tz` inheritance so that we don't need to change the path underneath the module. See #6165

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