MCprep 3.5 - Annotate and docummented util functions

[zNightlord]

As part of #401 add annotations to common functions
*edit: Also using f string
And #315 add a README docummented util.py

[zNightlord]

@StandingPadAnimations should be good with the anotations and f strings now.
I moved PathLike and VectorType to conf.py because circular import

[TheDuckCow]

Thanks for working on these changes! Just an FYI that since your branch here is based on top of this PR #401, we'll want to merge that one first before we do this one.

In the end, milestone-3-5-0 is the actual feature branch which will represent MCprep 3.5 (and won't be merged to dev until we're closer to having it all ready)

[TheDuckCow]

Will re-review once we have #401 merged into the milestone-3-5-0 branch, seems you'll need to merge mcprep's milestone-3-5-0 branch into your branch here to resolve conflicts with recent changes. Thanks again for proactively working on this!

[TheDuckCow]

Hey @StandingPadAnimations I noticed you closed this PR, was that intentional?
@zNightlord I believe your changes are still relevant (given my stance on not proceeding with #423)

Might need to re-open a new PR since I can't edit the base branch to be the milestone one.

[StandingPadAnimations]

Hey @StandingPadAnimations I noticed you closed this PR, was that intentional?

GitHub automatically closes PRs that refer to deleted branches, and recore was deleted after being merged