RGBPercToHex

__NOTOC__
Takes a RGB percent set (0.0-1.0) and converts it to a hex string.
 local function RGBPercToHex(r, g, b)
 	r = r <= 1 and r >= 0 and r or 0
 	g = g <= 1 and g >= 0 and g or 0
 	b = b <= 1 and b >= 0 and b or 0
 	return string.format("%02x%02x%02x", r*255, g*255, b*255)
 end