Nx3d

- BREAKING CHANGE: removed plot_nx3d in favor of using the NxPlot class directly
- implemented keyboard and mouse camera controlls
- implemented GUI
- implemented undocumented but tiny CLI
- added lots of debugging features
- lighting improvements
- node labels implemented, buggy
- edge labels implemented, buggy
- label colors implemented, buggy

Thurs Sep 15 2022

- Updated with ReadTheDocs webhooks, no change in functionality but revved to push the updated README to PyPi

- Removed metadata from `__init__.py`; all that goes in pyproject.toml
- Added docs/
- Configurable colors and sizes

Wed Sep 14 2022

- Fixing packaging
- Looser requirements for dependencies rather than arbitrarily specifying latest
- Added `__main__.py`
- Added metadata and explicit imports to `__init__.py`

- First release with minimum viable featureset:
- plots nodes
- plots edges