Add radon and VOC measure

[Allram]

Added 3 new custom capabilities:
measure_voc
measure_radon_shortterm
measure_radon_longterm
Added translations for the new capabilities for DE,EN,NL and NO.

Added icons from: Noun Project (bought)

[ArjanKranenburg]

Again, thanks a lot for your contributions! Much appreciated!
As said, I'm not too happy to add new capabilities. What if Athom adds similar capabilities later? Did you ask Athom to add them?
Is this reflecting a real device for measuring radon and particals? Did you consider creating an app just for that?
Also I've added functionality to upload custom icons in order to not having to include new icons. The footprint of the app is getting to large already.
Nice icons, BTW. Did you bought them?

With kind regards,

Arjan

[Allram]

I bought the icons from the Noun project, so they are free to use.
I haven't asked Athom to add the capabilities yet, i can do that.

I use the values for my Airthings radon measure devices. There is an Homey app for it, but Homey and BLE is tragic at the moment, so it's really hit'n miss if i manage to grab the values. So i grab the values from Airthings devices with a Python script on a RPI and sent it to MQTT and then i add the values to Homey Virtual Device :)