Switch from using yapf to Black for formatting

[jamescooke]

Switch from using yapf to Black for formatting

[jamescooke]

Black has annoyed me too much on other projects - mainly because it's not configurable enough and gives little control, especially around how args / kwargs are laid out. Yapf continues to give that control (adding trailing comma means that args are split over multiple lines, for example).

Might also rip out pylint because it annoys me too much too - and seems to give little benefit.

Will continue to rock on with flake8, yapf, mypy.