Map local guids 6.x -> 4.3.4

Ported the following commits:
https://github.com/TrinityCore/TrinityCore/commit/ca83e14f8b141fab0a13e08f48fca6c1ace0c4c7
https://github.com/TrinityCore/TrinityCore/commit/ee1c1b97be4492ecabe8b15ea6323fc37e4eaa8c
https://github.com/TrinityCore/TrinityCore/commit/18e4ab6911468b829b0fc768e532a770263c3717
https://github.com/TrinityCore/TrinityCore/commit/bf37446b3c2ed73b4d3aa9e227d3eff5c53b378b
https://github.com/TrinityCore/TrinityCore/commit/cb854a2b7bb7bd96cf9c4d1daf3789f797bf4db8

src/server/game/Instances/InstanceSaveMgr.cpp

@@ -551,7 +551,10 @@ void InstanceSaveManager::_ResetInstance(uint32 mapid, uint32 instanceId)
         ((InstanceMap*)iMap)->Reset(INSTANCE_RESET_RESPAWN_DELAY);
 
     if (iMap)
+    {
         iMap->DeleteRespawnTimes();
+        iMap->DeleteCorpseData();
+    }
     else
         Map::DeleteRespawnTimesInDB(mapid, instanceId);