Replaced os.path with pathlib

[trag1c]

Hey, I just made a Pull Request!

Description

Changes all occurrences of os.path to use pathlib instead.

Motivation and Context

Closes #179

Have you tested this? If so, how?

Updated unit tests :)

Checklist for PR author(s)

• Changes are covered by unit tests (no major decrease in code coverage %).
• All tests pass.
• Docstring coverage is 100% via tox -e docs or interrogate -c pyproject.toml (I mean, we should set a good example 😄).
• Updates to documentation:
  • Document any relevant additions/changes in README.rst.
  • Manually update both the README.rst and docs/index.rst for any new/changed CLI flags.
  • Any changed/added classes/methods/functions have appropriate versionadded, versionchanged, or deprecated directives. Find the appropriate next version in the project's __init__.py file.

Release note

NONE

[trag1c]

Not sure if this deserves a release note or any versionchanged directives.

I'll take a look at Windows' fails tomorrow 👍

[trag1c]

I'll take a look at Windows' fails tomorrow 👍

Took a bit longer but I'm getting OSErrors, seems like Windows can't install cairosvg 🤔 I feel like I'm doing something wrong here.

@econchick Could you approve the workflow? 😄

[msftcangoblowm]

Have been here myself.

Getting the paths to work on all platforms and only being able to test thru a gh workflow.

Here is a module that is specifically for the challenge this PR is about

https://github.com/msftcangoblowm/wreck/blob/master/src/wreck/_safe_path.py

If you hit a brick wall or feel going around in circles, this code might be helpful