Adds external category search

Extends the inventory filter to include searching through external category tags provided by other mods.

AetherBags/Inventory/Categories/InventoryFilter.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Text.RegularExpressions;
 using AetherBags.Helpers;
 using AetherBags.Inventory.Items;
+using AetherBags.IPC.ExternalCategorySystem;
 
 namespace AetherBags.Inventory.Categories;
 
@@ -46,6 +47,11 @@ public static class InventoryFilter
                     isMatch = info.Name.Contains(filterString, StringComparison.OrdinalIgnoreCase) || info.DescriptionContains(filterString);
                 }
 
+                if (!isMatch)
+                {
+                    isMatch = ExternalCategoryManager.MatchesSearchTag(info.Item.ItemId, filterString);
+                }
+
                 if (isMatch != invert)
                     filtered.Add(info);
             }