Core/Corpses: Misc fixes

* Updated corpse flags
* Fixed corpse guid during creation
* Properly set corpse faction
* Fixed setting weapon inventory types if transmogrified
* Fixed corpse location query response when corpse cannot be found

src/server/game/Handlers/QueryHandler.cpp

@@ -173,6 +173,7 @@ void WorldSession::HandleQueryCorpseLocation(WorldPackets::Query::QueryCorpseLoc
     {
         WorldPackets::Query::CorpseLocation packet;
         packet.Valid = false;                               // corpse not found
+        packet.Player = queryCorpseLocation.Player;
         SendPacket(packet.Write());
         return;
     }