Runez

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* Added ``retry`` decorator, as well a ``python -mrunez retry`` command

* ``hdry()`` available via ``runez.log`` (allows to conveniently resolve ``dryrun=UNSET``)

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* Fixed bug in ``PythonSpec.speccified()``

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* Don't crash on ``plural(None)``

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* Unfortunately, click's ``mix_stderr`` seems to mean "ignore stderr please"

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* Added ``cli.exercise_main()`` and a typical ``runez.click.protected_main()``

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* Generalized ``diagnostics()``, simplified internals for ``cli`` fixture

* Allow for script invocations as well via ``cli.run(..., main="src/my-script.py")``

* Added ``wcswidth()``, corrected ``PrettyTable`` rendering with unicode characters