* DirectX video output plugin now uses triple buffering for YUV overlay. This
  improves the video quality a lot (no tearing) without affecting performance.
  (I knew double buffering sucked but I just discovered why triple buffering
   is better: you don't have to wait for the vsync to flip the buffers).

* Fixed the DirectX video output for non-overlay modes. It was only working
  in RGB16 before.

* Fixed the mouse autohidding feature in the DirectX plugin
 (at least partially).

* Fixed the spu decoder to take the pitch of the destination picture into
  account when rendering the subtitles (Implemented only for the YUV modes).