Improve version handing: setuptools, poetry
Drop problematic minver support.
Use single-source version from apkg/init.py.
Use more robust method of reading version from setup.py when using setuptools.
Make scripts/make-archive.sh update version using Dunamai tool from git - PEP 440 compatible.
Add poetry support with poetry-dynamic-versioning plugin providing dynamic versioning using Dunamai including version updates.