Restructure Repository

[dostuffthatmatters]

This closes #64.

• Use tests/ and jsonref directories instead of having all files in root
• Add black and flake8 as dev dependencies (next to pytest)
• In pyproject.toml use [project.optional-dependencies] notation instead of [tool.pdm.dev-dependencies] because then one can simply use pip install ".[dev]" to install optional dependencies
• Fix package build and GitHub actions

This is transparent to users. All import paths are the same.

[gazpachoking]

Looks good to me, thanks. Seems like some of the tests got moved out of the main file, but I don't see those tests removed from the main file?

[dostuffthatmatters]

Seems like some of the tests got moved out of the main file, but I don't see those tests removed from the main file?

I split the test classes in tests.py into five separate files (one file per test class):

I can revert it, of course. Just found that to look cleaner.

EDIT: In the commit 1eba891, I removed some tests I forgot to delete. Before and after the change there are 107 pytests, so all should be there.

[gazpachoking]

EDIT: In the commit 1eba891, I removed some tests I forgot to delete. Before and after the change there are 107 pytests, so all should be there.

Yep, that's what I meant, looks good now.

[gazpachoking]

Awesome. Thanks so much!

[dostuffthatmatters]

Awesome. Thanks so much!

Sure :) Would not like to have a package conflict somewhere down the road when two packages want to install the same filenames. Thank you for merging it.