Datapoint as value for heating.

[mbefore305]

Is your feature request related to a problem? Please describe.
Not related to a problem.

Describe the solution you'd like
I am controlling the heating in several rooms using this adapter.
In the schedules I have to kind of hard-code the low and high temperatures.
Would be great to have them (per schedule) bound to datapoints.
That would allow to change the temperatures in the VIS.

Describe alternatives you've considered

Additional context
Using VIS of iobroker to visualise the heating control.