Switch to using pathlib

[zmievsa]

Goals

• [ ] The ruff pathlib checks are enabled. :information_source: In order to do that, edit the part of pyproject.toml marked as TODO#89.
• [ ] Calls to os.path are replace with pathlib.
• [ ] Reading and writing files is replaced with Path.read_text and Path.write_text where feasible.
• [ ] All TODO#89 comments are addressed.

Estimate: 8h

Original request

Many parts of the project can be both sped up (though insignificantly) and made more readable by replacing os usage with pathlib usage. File reading/writing can also be made more readable in some places using Path.read_text and Path.write_text. If you have time on your hands, I think investing into this idea would be a good improvement

[roskakori]

Yes, probably a reasonable cleanup at some point.

[e-io]

@snowkoli I am already took it. You may check it in our discord server

@snowkoli Could you take another issue please? I booked this one 90 minutes ago already.

[e-io]

@roskakori This issue has more things to do than I suggested initially. Particularly, because tests also have many os.paths. Replacing them to pathlib leads to some errors, which I must improve.

However, I am interested to finish this. So, I'm gonna to spend next Sunday (July 28th) for this again. If I will not finish it within a couple of months, I'll leave a note here.