Setupmeta

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* Corrected egg publication for python 2.7

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* Publish egg for python 3.9, not publishing for 3.5 any more

* Corrected support for inlined versions (``__version__ = "..."`` in user's code)

* Stop using deprecated ``imp`` module with python3

* Moved to github actions

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* Corrected edge case to support git submodules

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* Verify that HEAD is up-to-date when bumping (57)

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* Further refine hooks (56)

* Add legacy hook to ease transition in rare cases.

* Ensure our dist finalization runs first.

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* Simplify hooks, and fix preprocessing not triggering when not already installed in environment. (54)