Envector

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Matt Hogan (6)
* Embraced 3.9+ support with more descriptive static typing.
* Expanded or added docstrings.
* Fixed some pytest failures associated with matplotlib opening multiple figures simultaneously.
* Added missing figures to the documentation.
* Updated the noxfile to support multiple virtual environment backends.
* Expand documentation on the reasons for the existence of envector.

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Matt Hogan (4)
* Reduce matrix of supported Python versions as to reduce burden of testing
* Add testing using GitHub Action. Windows, MacOS, and Linux (Ubuntu) is tested using 3.9 - 3.12, inclusive.
* Added local testing support using nox.
* Remove numpydoc from the documentation requirements as it is not used.

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Matt Hogan (3)
* Update docstrings to adopt the Napoleon docstring standard
* Add type-hints to most functions and methods
* Update the documentation to show more than a summary.

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Matt Hogan (1):
* Initial commit to GitHub as fork of nvector