Grenade/explosive damage fading

[ruler501]

I do like the curve with that more. I modified them to make sure they drop below one at range.

rquar: max/(((max^(1/4)-1)*x/range+1)^4);
rcub: max/(((max^(1/3)-1)*x/range+1)^3);
rsqr: max/(((max^(1/2)-1)*x/range+1)^2);
rlin: max/((max-1)*x+1);