Use automation to keep copyright headers up to date

[seanbudd]

Is your feature request related to a problem? Please describe.

It's a tedious manual task to update the update the years for our copyright headers in source code, and otherwise keep them consistent.

Describe the solution you'd like

Use an automated tool like autocopyright to keep the copyright headers up to date. Ideally this preserves some format where contributors can continue to add their name to various files' copyright headers.

It would be great to use pre-commit to run this and update the whole repositories copyright headers whenever the template/config changes.

Describe alternatives you've considered

Continue to update these by hand

Additional context

Migrating to an automated solution will be quite challenging as we have no consistent format for these currently, and we need to preserve the names of contributors.