New binding: Waterkotte EcoTouch heat pump

This is a binding for the Waterkotte EcoTouch based on the binding NovelanHeatPump.
The documentation is at https://github.com/sibbi77/openhab/wiki/Waterkotte-EcoTouch-Heat-Pump-Binding
which kind of exceptions can occur? Please add something meaningful to the log statement in order to debug more easily.