Adding PackeablePixel typeclass.
Adding PackeablePixel typeclass.

Twinside/Juicy.Pixels,clinty/Juicy.Pixels,Chobbes/Juicy.Pixels,Twinside/Juicy.Pixels,Chobbes/Juicy.Pixels,clinty/Juicy.Pixels,Twinside/Juicy.Pixels