Refactor all packages to use modern tools

[loftusa]

Our stuff is years old and is built for python 3.8 and still uses setup.py

Find that one guide I saw a few weeks ago that was like "the modern guide to python packaging" or whatever (need to look through my history or whatever and figure out where I saw it), and update all our stuff to be in accordance with that. I think it involves making a pyproject.toml file or whatever.

Do this after the book is sent to copy-editor. I will update this issue then with the link to that guide.