[MAINTENANCE] Update Python versions and other

[hmvege]

It's time to do some maintenance.

• Update Python versions
• Check if any other packages are outdated or needs to be updated
• Test scripts and make sure they run
• Look into adding a docker container for testing and verifying the setup

[hmvege]

Update the default python flake8 settings to include new plugins available to the linter. Further, fix SublimeText settings file such that it firstly attempts to use flake8 located in local directory, then it falls back on global / pipx flake8.

See https://github.com/DmytroLitvinov/awesome-flake8-extensions for flake8 extensions to add.

Just to name a few:

• flake8-bugbear
• tryceratops
• flake8-pie
• flake8-useless-asserts
• etc