replace `os` with `pathlib` where possible

[ChasonDeshotel]

OS is big and bulky. Pathlib does everything we want but faster and better

I have a branch with this work but it'll be next week before I can test it and shoot over the PR

[nebhead]

Good to know! So yeah, if there is a good example of how to replace those os functions with something else that is less bulky, definitely welcome. I'm not afraid of doing it myself, but maybe just give me an example of how you use this.