[svn] Implemented player on player and player on creature possession:

* Implemented packet and vision forwarding through possessed units
* Added new OnPossess script call alerting scripts on when possession is applied/removed
* Moved fall damage and fall under map calculations into the Player class
* Added new PossessedAI that is applied only while possession on creature is active
* Implemented summon possessed spell effect
* Fixed Eyes of the Beast

--HG--
branch : trunk

src/game/CreatureAI.h

@@ -121,6 +121,9 @@ class TRINITY_DLL_SPEC CreatureAI
 
         // Called at waypoint reached or point movement finished
         virtual void MovementInform(uint32 /*MovementType*/, uint32 /*Data*/) {}
+
+        // Called when AI is temporarily replaced or put back when possess is applied or removed
+        virtual void OnPossess(bool apply) {}
 };
 
 struct SelectableAI : public FactoryHolder<CreatureAI>, public Permissible<Creature>