chore(core): cleanup code p3 (#16073)

* Update MMapMgr.cpp

* Update UpdateFetcher.cpp

* Update AuctionHouseMgr.cpp

* Update AuctionHouseMgr.h

* Update BattlegroundAV.cpp

* Update ChannelMgr.cpp

* Update ThreatMgr.h

* Update Player.h

* Update PlayerSettings.cpp

* Update ObjectMgr.cpp

* Update Guild.cpp

* Update Guild.h

* Update Map.cpp

* Update World.cpp

* Update boss_nefarian.cpp

* Update boss_prince_malchezaar.cpp

* Update boss_venoxis.cpp

* Update zone_elwynn_forest.cpp

* Update zulfarrak.cpp

* Update boss_novos.cpp

src/common/Collision/Management/MMapMgr.cpp

@@ -253,7 +253,7 @@ namespace MMAP
 
         // unload all tiles from given map
         MMapData* mmap = itr->second;
-        for (auto i : mmap->loadedTileRefs)
+        for (auto& i : mmap->loadedTileRefs)
         {
             uint32 x = (i.first >> 16);
             uint32 y = (i.first & 0x0000FFFF);