New effect for Extra FX

I have to say, I quite liked the way fog looks now with distant emissives (more about it), only thing that was upsetting was the headlights not lighting up any fog around them. So I added a new effect to Extra FX adding that glow, it does something like primitive raytracing of headlights cones in 20% of main resolution, with screen split into 16 tiles to speed things up. I feel like there might be a better way of doing it, but not sure what it is for now.

Of course, without shadows, it does look a bit silly sometimes, but hopefully shadows would work later on.