Core/AuctionHouse: Updated AuctionHouseFilterMask and implemented current expansion filter

Port From (https://github.com/TrinityCore/TrinityCore/commit/5b278a4ca79dd8aa19cde3892d92ae857d6f1dd4)

Source/Game/AuctionHouse/AuctionManager.cs

@@ -625,7 +625,7 @@ namespace Game
                 }
             }
 
-            bucket.QualityMask |= (AuctionHouseFilterMask)(1 << ((int)quality + 4));
+            bucket.QualityMask |= (AuctionHouseFilterMask)((uint)AuctionHouseFilterMask.PoorQuality << (int)quality);
             ++bucket.QualityCounts[quality];
 
             if (trans != null)
@@ -733,7 +733,7 @@ namespace Game
                 }
 
                 if (--bucket.QualityCounts[quality] == 0)
-                    bucket.QualityMask &= (AuctionHouseFilterMask)(~(1 << ((int)quality + 4)));
+                    bucket.QualityMask &= (AuctionHouseFilterMask)((uint)AuctionHouseFilterMask.PoorQuality << (int)quality);
             }
             else
                 _buckets.Remove(bucket.Key);
@@ -937,6 +937,13 @@ namespace Game
                         continue;
                 }
 
+                if (filters.HasFlag(AuctionHouseFilterMask.CurrentExpansionOnly))
+                {
+                    ItemTemplate itemTemplate = Global.ObjectMgr.GetItemTemplate(bucket.Key.ItemId);
+                    if (itemTemplate.GetRequiredExpansion() != WorldConfig.GetIntValue(WorldCfg.Expansion))
+                        continue;
+                }
+
                 // TODO: this one needs to access loot history to know highest item level for every inventory type
                 //if (filters.HasFlag(AuctionHouseFilterMask.UpgradesOnly))
                 //{