Jaraco.util

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* Moved `jaraco.dateutil` to `jaraco.tempora` (but kept jaraco.dateutil for
compatibility). Expect `jaraco.dateutil` to be removed in 9.0.

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* Package no longer uses 2to3 for Python 3 support, but instead relies on a
unified code base and compatibility routines (including six).
* Moved ``wallpaper`` module to ``jaraco.desktop`` project.

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* ``dictlib.FrozenDict`` now supplies ``.copy``.
* Fixed issue in ``FrozenDict`` where ``.__eq__`` didn't work on other
FrozenDict instances.

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* Added ``dictlib.FrozenDict``.

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* Moved `blowfish` module to jaraco.crypto.
* Moved `image` module to jaraco.imaging.

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* Added `string.simple_html_strip`.