Core/Misc: Add <GM> tag to GMs in Who list

src/server/game/Server/Protocol/Handlers/MiscHandler.cpp

@@ -339,6 +339,12 @@ void WorldSession::HandleWhoOpcode(WorldPacket & recv_data)
         if ((matchcount++) >= sWorld->getIntConfig(CONFIG_MAX_WHO))
             continue;
 
+        if (itr->second->isGameMaster())
+        {
+            pname = "<GM>";
+            pname.append(itr->second->GetName());
+        }
+
         data << pname;                                    // player name
         data << gname;                                    // guild name
         data << uint32(lvl);                              // player level