Continuously hue color range for CO2 (instead of RGB green, yellow, red)

[balzer82]

I have mapped the CO2 value to Hue values for the RGB, so we have a continuously color range from 300...1200ppm CO2 (from green to red). Maybe you want to integrate it in the next versions. Line ~1344 for changes (ampel).

Sorry for all the Linting changes of my IDE