dix: Add ClientPointer to client, used for picking which pointer to use in

ambiguious request. PickPointer and PickKeyboard are used for getting
        the appropriate pointer when situation is unclear.
        Fix some issues with InitializeSprite.

dix, xfree86: Remove last traces of InitSprite.

include/dixstruct.h

@@ -140,6 +140,8 @@ typedef struct _Client {
     long    smart_stop_tick;
     long    smart_check_tick;
 #endif
+    
+    DeviceIntPtr clientPtr;
 }           ClientRec;
 
 #ifdef SMART_SCHEDULE