Cppyythonizations

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**Added:**

* add package to PyPI so we can `pip install cppyythonizations`

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**Fixed:**

* adapt serialization to changes in cppyy 1.9.0
* only run GitHub workflows once for master but not for pushes to tags.

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**Changed:**

* use GitHub Actions for CI

**Fixed:**

* fixed errors in doctests for tuple and vector pythonizations

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**Added:**

* workaround for printing and indexing into tuples, see https://bitbucket.org/wlav/cppyy/issues/272/pythonization-on-tuple-erases-__getitem__

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**Fixed:**

* typo in rever deployment script

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