Add Home Assistant device discovery

[PimDoos]

Adds support for Home Assistant device discovery. Overhaul on the autodiscovery code. Adds some device_class and icons to the sensors.

This makes the ComfoAir device visible in the 'Device' option in Home Assistant.

[PimDoos]

This is currently a breaking change as using 'comfoair' as the device name changes all entity ids from ca350_{name} to comfoair_{name}. Will update default config to keep it at CA350 for now.

[PimDoos]

These sensors will remain a breaking change, as they have been renamed by their display name:

• ca350_exhausttemp --> ca350_exhaust_temperature
• ca350_outsidetemp --> ca350_outside_temperature
• ca350_returntemp --> ca350_return_temperature
• ca350_supplytemp --> ca350_supply_temperature
• ca350_fan_speed_supply --> ca350_supply_fan_speed
• ca350_fan_speed_exhaust --> ca350_exhaust_fan_speed

[PimDoos]

Now with climate

[adorobis]

Looks great, let me test it later today. Many thanks for another contribution!

[adorobis]

• ca350_exhausttemp --> ca350_exhaust_temperature
• ca350_outsidetemp --> ca350_outside_temperature
• ca350_returntemp --> ca350_return_temperature
• ca350_supplytemp --> ca350_supply_temperature
• ca350_fan_speed_supply --> ca350_supply_fan_speed
• ca350_fan_speed_exhaust --> ca350_exhaust_fan_speed

I'm just testing now. Above sensors have not been renamed, device is now discovered by MQTT integration but no entities are linked to it: Not sure what's wrong, will try to figure it out.

[adorobis]

I think in the auto discovery of sensors the entity ids are still the old ones so most likely some more things are missing.

[adorobis]

OK, HA restart was required. All works ok, thanks!

[PimDoos]

Thanks for merging! I noticed we still need to update the README.md to reflect the new configuration options and entity names. I'll submit a PR for that in a bit.