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Upgrade isort and set default dev interpreter to Python 3.8 (#602)

Update a few things related to the dev environment:
 * Set the default development interpreter version to Python 3.8. This should help improve startup times a bit to help iteration during development.
 * Lock dev dependencies again for Python 3.8. This resulted in updating isort to version 5.0, which produced a pretty significant diff (and made me break this PR out from #601). 
    * In so doing, I also took this opportunity to update a few places where I'd used `as keyword`, `as symbol`, and `as vector` import aliases rather than `as kw`, `as sym`, and `as vec` respectively. Should make it easier to contribute new code anywhere and not be surprised about the alias in use.

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