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).
- If a Python optional dependency is available as a system package on
the target system, try and install it that route rather than pip. It's
usually faster and it decreases the risk of breaking system packages.
- Added support for apk dependencies in manifest files. This brings the
number of distros officially supported by all the extensions to four:
- Alpine
- Arch
- Debian
- Ubuntu