* Addresses #478, adding a heading class to represent headings and angles
Removed some unused code
* Fixing bad merge
* Formatting
* Fixing type issues and other merge resolution misses
This is as much as we can do until pydcs actually adds the py.typed
file. Once that's added there are a few ugly monkey patching corners
that will just need `# type: ignore` for now, but we can't pre-add those
since we have mypy warning us about superfluous ignore comments.
