Prepare 0.13.3 release

[hakonanes]

Description of the change

Brings changes in develop into main for the 0.13.3 release. Planned release January 1.

Other changes:

• Replace use of NumPy deprecated row_stack() with vstack() (silence warnings)
• Add licenseheaders template to pre-commit hooks.

Regarding licenseheaders. I suggest the following new routine: Only update the license header year when a file is actually changed. This is handled by pre-commit. This means we won't change the year in all files once a year.

Progress of the PR

• Docstrings for all functions
• Unit tests with pytest for all lines
• Clean code style by running black via pre-commit

For reviewers

• The PR title is short, concise, and will make sense 1 year later.
• New functions are imported in corresponding __init__.py.
• New features, API changes, and deprecations are mentioned in the unreleased
  section in CHANGELOG.rst.
• Contributor(s) are listed correctly in __credits__ in orix/__init__.py and in
  .zenodo.json.

[hakonanes]

@CSSFrancis, the pre-commit CI check fails for licenseheaders. There are no pre-commit logs. However, I believe it is because it runs the licenseheaders hook on all files, not just the ones changed in this PR... Any suggestions on how to fix this?

One solution is to run licenseheaders with the new template on all files. The licenseheaders hook in future PRs must pass, then.

[hakonanes]

I decided to skip the licenseheaders check for now, but added a TODO comment to remove the skip at a later time when we're close to updating most files' headers with pre-commit and licenseheaders locally.

[pc494]

I'm happy with this, seems like an elegant way to tackle license headers.

[hakonanes]

Thanks for the review! I'll release over the weekend.