Oathtool

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No significant changes.

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Refreshed package metadata.

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Add a console entry point and reference to pipx for installation.

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``generate-script`` now defaults to 'oathtool' but allows
it to be overridden.

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Added ``oathtool.generate-script``, a runpy executable
routine to generate a standalone runtime executable script
on Unix-like systems honoring shebangs and executable bits.

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Packaging refresh. Requires Python 3.6 or later.