Update Tickler to use threading events for stopping.

[lach1010]

Noticed that shutdown is very slow when using oAuth due to secondary thread in Tickler waiting for sleep(60) to end.

This update uses threading events to wake the thread immediately on .stop()

Wasn't able to run all the tests due to the test_utils.py usage of _testcapi which isn't available in Python as packaged by uv.

Couple project settings changes to support dev on MacOS and developers with Ruff installed.

Would be curious to hear thoughts on using Ruff in this project as formatter and linter.

PS. This is my first contribution to a third party package. What's the best way test changes outside of unit tests?

[Voyz]

Hey @lach1010 thanks for your PR! The replacement of self._running for threading.Event is great, I appreciate you spotting it and contributing a solution 👍

You seem to intertwine three other subjects into this PR: the tests not working on your MacOS, support for Ruff and contributing guidelines. In general it would be best for each to be addressed in a separate issue, rather than bundled up.

As for tests not working on your MacOS, please open a separate issue to discuss it.

As for Ruff, there's an open PR adding it in: #50

As for contributing guidelines, I'm working on these. In the meantime, please open a separate issue to discuss the question you've posted.

---

As for this PR, when you find a minute please remove the pyproject.toml / Ruff additions, and I'll be happy to merge it in. Thanks!

[lach1010]

Thanks mate.

I've removed the other changes. Will open another issue for them.

[Voyz]

Great job! Merging this in now, thanks for the contribution! 🙌