Runez

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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

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* Moved development related functions to ``runez.DEV``

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* Added ``{project}`` placeholder for ``runez.log.setup()``

* Updated code to use ``SYS_INFO`` instead of deprecated ``runez.log`` calss

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* Allow ``dict`` source for ``two_column_diagnostics()`` render

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* Added ``cached_property.to_dict()``