Abilian-core

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Breaking changes:

- Removed deprecated plugin loader
- Renamed `is_support_attachments` to `supports_attachments`

Other:

- Refactoring tests to use pytest's function-based tests instead
of unittest's class-based tests.

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- Cleanup
- Bug fixes
- Python 3 compatibility
- Dependencies updates

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- Don't depend on psycopg2, so you can use your favorite driver
(ex: pg8000).

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- Relax dependency constraint on Bleach to allow upgrade
of other deps.

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- Cleanup
- Fix some warnings.

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- JS cleanup and linting
- Deps updates