Runez

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* Don't use globals in ``PythonDepot``

* Better formalized what is logged by ``read_json()`` and ``readlines()``

* Respect ``logger=None`` (no log chatter at all), vs ``logger=False`` (fall back to trace)

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* Added ``runez.pyenv`` module

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* Corrected bug with progress stdout/err re-capture

* Show sorted import times in ``import-speed`` command

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* Don't hide cursor in progress spinner, so we can't ever miss not showing it back

* Simplified how logsetup references are resolved

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* Added ``ProgressBar``, corrected flickering in spinner

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* Added progress spinner, can be activated with ``runez.log.progress.start()``

* Corrected bug in ``{argv}`` expansion