Add thermostat support for Mitsubishi Kumo Cloud

The new public beta of thermostat support looks great! My only problem is that it does not support our Mitsubishi heat pump. We are forced to use the Mitsubishi branded thermostat with our system since the it is much more advanced than the simple “on/off” or "on/on stage 2/off” of third-party thermostats. It is wifi-connected and we have remote mobile app access via their Kumo Cloud system; however, hospitable doesn’t (yet?) support Mitsubishi Kumo Cloud.