Core: Add wintergrasp-patch to wintergrasp_cleanup branch - resurrected from an old work-repository, now over as a branch to work on.

Original patch by socolin, cand a ton of contributors :
mathman, joda, spp, silinoron, josh, malcrom, shauren, machiavelli, click, rat, leak, tobmaps, _manuel_, the tcfr team (via socolin), and tons of others for chiming in.

NOTE: THIS IS A WORKING-BRANCH, AND _NOT_ MENT FOR PUBLIC USE OR EVEN CONSIDERED STABLE!

src/server/game/Entities/Object/Object.cpp

@@ -41,7 +41,7 @@
 #include "GridNotifiers.h"
 #include "GridNotifiersImpl.h"
 #include "SpellAuraEffects.h"
-
+#include "BattlefieldMgr.h"
 #include "TemporarySummon.h"
 #include "Totem.h"
 #include "OutdoorPvPMgr.h"
@@ -2210,7 +2210,12 @@ void WorldObject::SetZoneScript()
         if (map->IsDungeon())
             m_zoneScript = (ZoneScript*)((InstanceMap*)map)->GetInstanceScript();
         else if (!map->IsBattlegroundOrArena())
-            m_zoneScript = sOutdoorPvPMgr->GetZoneScript(GetZoneId());
+        {
+            if (Battlefield* bf = sBattlefieldMgr.GetBattlefieldToZoneId(GetZoneId()))
+                m_zoneScript = bf;
+            else
+                m_zoneScript = sOutdoorPvPMgr->GetZoneScript(GetZoneId());
+        }
     }
 }