Implement new pfGameScore class and friends

pfGameScore will call you back on actions that require server ops. Also, we
ref count the score instead of using some weird hashtable manager class
because the server never actually tells us if someone else changes the
score.

Sources/Plasma/NucleusLib/inc/plCreatableIndex.h

@@ -947,6 +947,10 @@ CLASS_INDEX_LIST_START
     CLASS_INDEX(plAngularVelocityMsg),
     CLASS_INDEX(plRideAnimatedPhysMsg),
     CLASS_INDEX(plAvBrainRideAnimatedPhysical),
+    CLASS_INDEX(pfGameScoreMsg),
+    CLASS_INDEX(pfGameScoreListMsg),
+    CLASS_INDEX(pfGameScoreTransferMsg),
+    CLASS_INDEX(pfGameScoreUpdateMsg),
 CLASS_INDEX_LIST_END
 
 #endif // plCreatableIndex_inc