Runez

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* Avoid creating anything at import time (removed most globals)

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* Allow to configure a ``preferred_python`` in ``PythonDepot``

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* Added ``__repr__`` to ``RunAudit``

* Corrected docstrings

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* More generic parsing of ``PythonSpec``

* Respect optional checksum in url, in ``decompress()``

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* Restore ``cwd`` after a ``cli`` test command run

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* Moved release notes to wiki: https://github.com/codrsquad/runez/wiki/Release-notes

* Corrected ``thread_local_property`` decorator

* Dropped support for python2

* Added ``runez.http``