2022 Code Refresh

[LaikaN57]

• Removed circle lint/test (I intend to fast-follow to add github actions)
• Update Makefile to use python3 and venv. We also put in some good boiler-plate
• Ran isort and black on all code and setup.py
• Changed to f-strings
• Updated logging.warn calls to logging.warning calls
• Ensured logging.log calls used %s strings (not that we need to, just good practice)
• Moved from nosetest to pytest
• Fixed literal comparison warning with is not (The original thing that was annoying me and lead to the scope-creep that is this PR.)
• Version bump 1.0.3 to 1.0.4
• Updated requirements to be a bit more sane

...The tests pass.

Supersedes #28

I am soft-deprecating Python 2 support although all of this should still work just fine in Python 2 still.