Run black and isort on entire repo

Created by: APJansen

Feel free to delete, I don't oversee whether this may be more of a headache than it solves, but I just wanted to get rid of all the diffs that are just from applying black or isort. So here I did only that, in the top level of the repo, black . and isort ..

There was one file that black couldn't reformat, due to this line which apparently uses Python 2 syntax. I didn't touch that, literally only did the 2 commands above.