Added an `add_dependencies` plugin to the Sphinx build process that
parses the manifest files of the scanned backends and plugins and
automatically generates the documentation for the required dependencies
and triggered events.
This means that those dependencies are no longer required to be listed
in the docstring of the class itself.
Also in this commit:
- Black/LINT for some integrations that hadn't been touched in a long
time.
- Deleted some leftovers from previous refactors (deprecated
`backend.mqtt`, `backend.zwave.mqtt`, `backend.http.request.rss`).
- Deleted deprecated `inotify` backend - replaced by `file.monitor` (see
#289).
It was just too painful to find a combination of versions of gunicorn,
gevent, eventlet, pyuwsgi etc. that could work on all of my systems.
On the other hand, Tornado works out of the box with no headaches.
Also in this commit:
- Updated a bunch of outdated/required integration dependencies.
- Black'd and LINTed a couple of old plugins.
