[netatmo] Extend webhook support for doorbell and presence camera (#14252)

[netatmo] Extend webhook support for doorbell and presence camera (#14252)

* [netatmo] Web hook extension for camera events

- Unused camera-event trigger channel removed
- README updated to the real supported channels (compared with channels.xml and code)
- Camera capabilities are now triggering the home-event trigger channel
- New home-event trigger channel introduced at camera level
- New sub-event channels introduced for the presence camera which is updated by web hook events.
- Language file updated
- README updated
- typos fixed
- security-event trigger channel added for the Welcome camera
- Handling of sub-event groups fixed to work with doorbell and presence cameras.

---------

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
Signed-off-by: Sven Strohschein <novanic@gmx.de>