RGBToHex

__NOTOC__
Takes a RGB value set (0-255) and converts it into a hex string.
 local function RGBToHex(r, g, b)
 	r = r <= 255 and r >= 0 and r or 0
 	g = g <= 255 and g >= 0 and g or 0
 	b = b <= 255 and b >= 0 and b or 0
 	return string.format("%02x%02x%02x", r, g, b)
 end