DSP HLE: Break out the ADPCM decoder, add a few comments.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3504 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Plugins/Plugin_DSP_HLE/Src/UCodes/UCode_Jac.h

@@ -20,6 +20,10 @@
 
 #include "UCodes.h"
 
+// This uCode should be deleted and replaced with a small modification of the Zelda uCode.
+// The big difference is that games using this one won't send "message counts"
+// before sending the command data.
+
 class CUCode_Jac : public IUCode
 {
 private: