anchor: love.math.colorFromBytes
  Converts a color from 0..255 to 0..1 range.
  r, g, b, a = love.math.colorFromBytes( rb, gb, bb, ab )
  rb number Red color component in 0..255 range.
  gb number Green color component in 0..255 range.
  bb number Blue color component in 0..255 range.
  ab (nil) number Alpha color component in 0..255 range.
  r number Red color component in 0..1 range.
  g number Green color component in 0..1 range.
  b number Blue color component in 0..1 range.
  a number Alpha color component in 0..1 range or nil if alpha is not specified.