This is a commit to automatically sort all imports before adding a new linter that will enforce this new sorting.
The command used was (excluding contrib/):
isort --profile=black --line-length=79 .
The rationale for --profile=black is that this generate the same style of multiline imports that we already use: one import per line with trailing commas, use parentheses, ensure newline before comments.
Also, black is increasingly popular and we may want to use it instead of autopep8 some day in the future. So it is a good idea to stay compatible.
The rationale for --line-length=79 is that it is the standard for autopep8, and is more strict (hence compatible with) black which uses 88.