[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/bindings/scripts/include/sc_creature.h

@@ -75,6 +75,9 @@ struct TRINITY_DLL_DECL ScriptedAI : public CreatureAI
     //Called at waypoint reached or PointMovement end
     void MovementInform(uint32, uint32){}
 
+    // Called when AI is temporarily replaced or put back when possess is applied or removed
+    void OnPossess(bool apply) {}
+
     //*************
     // Variables
     //*************