Helios KWL binding (via RS-485 of the Remote Control Interfase)

As promised I started to work on a binding to access the KWL from Helios via the RS485 bus used for the remote control delivered with the device.

I have submitted a PR and hope for some review. Even though already working I’d say it is still work in progress and I’d be happy to get comments from the experts and also some other (potential) users. What are the most important features / data points that you are interested in? Which are crucial for including it into openhab, which are nice to have?