GIF: 
-Implemented GIF_MODE Masking fixed the All Star Pro Wrestling series slowness/hanging.

DMA: 
-Standardize the IPU and SIF dma's to use the standard chain handling in hw.c, fixed up some DMA resuming stuff in the forementioned units, VIF, GIF and SPR.

-Added some warnings for DMA stall control which isn't implemented, hopefully somebody will find a game that does it so we can add/test it :)

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@5915 96395faa-99c1-11dd-bbfe-3dabce05a288