Abilian-core

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- Numerous typing fixes.

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- Fix licence in package metadata.

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- Cut a new release to fix the docs.

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- Prevent upgrading to SQLAlchemy 1.4

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- Fix tests.
- Cleanup API.
- Use sentry sdk instead of raven.
- Cleanup.

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- Format.
- Docstrings.
- Fix/silent lint errors.
- Cosmit py3k.
- Format.
- Marketing.
- Modernize code.
- Prettify front-end.
- Use proper booleans.
- Ci: add nox tests.
- Ci: fix noxfile.
- Ci: refact tox config.
- Ci: use bionic for travis.