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).
Remove `backend.sensor.distance` and `gpio.sensor.distance`. They are
now replaced by the `sensor.hcsr04` integration, which is compatible
with the new `SensorPlugin` API.
- Using `@action` annotation to indicate methods that are allowed to be
executed as actions
- The output and errors of an action are automatically wrapped into a
`Response` object without any response build required on the plugin side
