Support for multiple Heatpumps

[onemorename]

As i try to open a second and/or third heatpump the existing sensor values are overwritten by the new one's.

It would be great if multiple Heatpumps could get added - as this would allow to montor & track the performance and efficiency of them in parallel

[BenPru]

@onemorename I have create a new branch multiple_heatpumps for this.
I try to implement the changes for multiple heatpumps in it. Currently it's still work in progress.

At the moment the sensors are prefixed with the domain (luxtronik2) e.g. "sensor.%domain%*".
Another heatpump creates the same sensors and they are overwritten.
The integration name is default the ip address of the heatpump.
This branch changes the sensor prefix from domain if the integration name is unequal to the ip address.
E.g. "sensor.%integration_name%*"
The device names are also extended with the integration name:

• "Heatpump S/N %sn%" --> "Heatpump %integration_name% S/N %sn%"
• "Heating" --> "Heating %integration_name%"
• "Domestic water" --> "Domestic water %integration_name%"

[BenPru]

Current draft: https://github.com/BenPru/core-1/tree/luxtronik/homeassistant/components/luxtronik