[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/Spell.h

@@ -240,6 +240,7 @@ class Spell
         void EffectDualWield(uint32 i);
         void EffectPickPocket(uint32 i);
         void EffectAddFarsight(uint32 i);
+        void EffectSummonPossessed(uint32 i);
         void EffectSummonWild(uint32 i);
         void EffectSummonGuardian(uint32 i);
         void EffectHealMechanical(uint32 i);