Replace the atmosphere parameters with more accurate ones from ARPC

This looks great! There are a lot of tweaks that could be done with the lighting engine, unfortunately for us VR flyers all these lovely cloud colors will be totally overexposed due to another problem, which is how metering is implemented. That bug here: https://forums.flightsimulator.com/t/implement-a-metering-system-better-suited-for-vr