[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/ObjectAccessor.h

@@ -208,8 +208,11 @@ class TRINITY_DLL_DECL ObjectAccessor : public Trinity::Singleton<ObjectAccessor
         {
             UpdateDataMapType &i_updateDatas;
             WorldObject &i_object;
+            std::set<uint64> plr_list;
             WorldObjectChangeAccumulator(WorldObject &obj, UpdateDataMapType &d) : i_updateDatas(d), i_object(obj) {}
             void Visit(PlayerMapType &);
+            void Visit(CreatureMapType &);
+            void BuildPacket(Player* plr);
             template<class SKIP> void Visit(GridRefManager<SKIP> &) {}
         };