Migrate to python 3, add test suite and real test data using pytest, maybe add CI/CD (maybe unneeded

[billgreenwald]

If anyone wants to do this they are welcome to, otherwise itll come slowly over time

• [x] Upgrade to python 3
• [x] Add pytest support for existing test files
• [x] Add pytest support for actual functionalized refactor
• [x] Add pytests to cover all edge cases of package by creating better test files
• [x] Rename from master to dev for actual use branch
• [x] Tag some versions nicely instead of just having massive push logs
• [x] Add a changelog
• [x] Protect the dev branch and use PRs, even if self-approved, to ensure tests are run properly.
• [x] Add github actions for running tests on PRs
• [x] Change tests to source module locally so they pass github actions