Rewrite rebuild_pipreinstall_and_testexamples.sh in python

[douglaskastle]

rebuild_pipreinstall_and_testexamples.sh does not work in windows land. cmd does not have shell (I am referring to local windows machines, not powershell)

A similar script written in python should work on all systems as python is the only prerequisite required to run the whole show.

[myselfhimself]

Agreed, I want travis CI and github actions on par.
This can indeed by either 3 or N python commands or 1 python script running those same python commands.

[douglaskastle]

There are some actions in that one script that should maybe live in more than one. On a normaller work I might do it all with a makefile. There are individual recipes in there that I may want to call individually or altogther.

Sadly make is a missing from window cmd as sh is.

Investigating python equivalents:

https://pypi.org/project/py-make/