-----------------
* 32 sprites with clipping, overwrite, ordering and collision detection (mode 0 and mode 1)
* 4 modes of sprites sorting modes, based on Ymax or Ymin, partial or complete
* sprite/image flipping (mode 0 and mode 1)
* animation sequences, and macrosequences. Any sprite can change automatically its animation sequence depending on its parameters Vy,Vx