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
please remove the given values (since they are optional). Better refer to them in the description of these properties.