Stop OpenEyeToolkitWrapper from erroring on planar trivalent nitrogens if they have trivalent carbon neighbors

[j-wags]

• Makes OpenEyeToolkitWrapper.from_openeye not raise an undefined-stereo error/warning for planar Ns if they have at least one trivalent carbon neighbor (This isn't a perfect solution but does cover a large fraction of the annoying over-policing of nitrogen stereo by OETKW)
• Closes Undefined stereo error depends on the toolkit. #725
• Closes from_openeye doesn't percieve nitrogen stereochemistry, even if coordinates are available #626
• Closes Saturated Planner nitrogen #1547
• Add tests
• Lint codebase
• Update changelog

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.09%. Comparing base (a935532) to head (086812b).

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[j-wags]

Fingers crossed that the docs build issues are transient - I'll try a rebuild after the long weekend.