Core/Players: Don't set instanceId to 0 when player is on transport during loading, there CAN be transports inside instances

Core/Scripts: Added waypoint id to OnRelocate transport hook
Core/Scripts: Make use of ZoneScript::GetGameObjectEntry at gameobject creation (makes it possible to override gameobject entries in instances)
Core/Transports: Call InstanceScript::EventInform for transport events
Core/Transports: Use guid from db for transports, not just its entry - adds partial support for instancing them (still cannot use transports table for it, but can spawn manually now)
Scripts/Icecrown Citadel: Fixed crash in Deathbringer Saurfang when event is started by more than one person (can't do this anymore)

Closes isssue #3749.

--HG--
branch : trunk

src/server/game/Scripting/ScriptMgr.h

@@ -623,7 +623,7 @@ class TransportScript : public ScriptObject, public UpdatableScript<Transport>
         virtual void OnRemovePassenger(Transport* /*transport*/, Player* /*player*/) { }
 
         // Called when a transport moves.
-        virtual void OnRelocate(Transport* /*transport*/, uint32 /*mapId*/, float /*x*/, float /*y*/, float /*z*/) { }
+        virtual void OnRelocate(Transport* /*transport*/, uint32 /*waypointId*/, uint32 /*mapId*/, float /*x*/, float /*y*/, float /*z*/) { }
 };
 
 class AchievementCriteriaScript : public ScriptObject
@@ -870,7 +870,7 @@ class ScriptMgr
         void OnAddCreaturePassenger(Transport* transport, Creature* creature);
         void OnRemovePassenger(Transport* transport, Player* player);
         void OnTransportUpdate(Transport* transport, uint32 diff);
-        void OnRelocate(Transport* transport, uint32 mapId, float x, float y, float z);
+        void OnRelocate(Transport* transport, uint32 waypointId, uint32 mapId, float x, float y, float z);
 
     public: /* AchievementCriteriaScript */