Fix: enhance regex album name post processing

[DSchmidtDev]

This PR enhances the regex album name post processing to
(1) be able to use equal signs in your regex
(2) use python regex module which allows more features like e.g. infinite width lookbehind patterns

and just for convenience adding a gitignore file

[Salvoxia]

Thanks!
A question regarding the new requirement regex==2024.11.6. That looks like an awfully recent version and I'm worried about compatibility with older systems out there. Is that version absolutely required?

[DSchmidtDev]

It's not absolutely required. But I personally like to have pinned dependencies to have clarity about the version and behavior (if it might change in future) especially if there are no tests to cover it.
I guess most of the user are using the docker image with python3.12 anyway so there should not be any conflicts.

But its your project and if you want we can remove the version

[Salvoxia]

It occurred to me that venvs should be an option, too. So let's roll with it.