Added support for Vaillant Thermostat, how to integrate in official release

Great @pjmaenh , thank you so much :slight_smile:

I would be more than happy to test this for you, unfortunately restoring my hass.io resulted in a malformed database disk image, still hoping that I can some repair this file so I’ll not lose my history data (https://community.home-assistant.io/t/db-image-malformed-how-to-fix-it/76413/4)