Notable changes:
* Prettier >=2.3 with more consistent js assignments
* Black now formats docstrings
* Added isort to list of autoformaters
* Update flake8 config for v4
Ref: https://prettier.io/blog/2021/05/09/2.3.0.html
* Rename instances of win32 to generic win or the appropriate bit where applicable
* Remove files used in GTK2
* Add spec file for use with PyInstaller
* Remove Python bbfreeze Script
* Add Github Action To Build Releases
* Add Modified script to make files used by NSIS
* Update Readme
Closes: https://github.com/deluge-torrent/deluge/pull/331