Add/update headers for all active files, add pre-commit

[voetberg]

Addresses #141

Looks huge but it's just sorting imports according to the ruff settings from the main repo and adding headers to everything except probes in the attic. Doesn't address any of the concerns the pre-commits (either flake8 or ruff) bring up.

[rdimaio]

There's a few conflicts, please rebase

[dchristidis]

There are many more shortcomings, like not handling existing licences in triple-quoted strings, removing useful comments, not treating utils as a local import, bundling other smaller fixes together in the same commit.

Plus I’m concerned about having to maintain the same files across different repositories.

[voetberg]

There are many more shortcomings, like not handling existing licences in triple-quoted strings, removing useful comments, not treating utils as a local import, bundling other smaller fixes together in the same commit.

These are all fixable, no problem.

Plus I’m concerned about having to maintain the same files across different repositories.

We can pull just the 'add_header' script from the main repo if we don't want to bother with maintaining that file in particular. As for the ruff toml, it's different enough that I think it's worth the work. Same goes for a pre-commit, but I'm a sucker for automation.