[feat:] (opt) delete original sets after merging

Tasks/CombineAddresses.cs

@@ -24,13 +24,29 @@ public class CombineAddresses
     }
 
     public async Task<(KasAddressList, KasAddressList)> Perform(List<KasAddressList> address_lists, string type, CombineType comb_type,
+        bool? exportUnused, bool? deleteOld)
+    {
+        var result = await Execute(address_lists,type,comb_type,exportUnused);
+
+        if (deleteOld == true)
+        {
+            foreach (var list in address_lists)
+            {
+                Settings._instance.addressSets.addresses.Remove(list);
+            }
+        }
+
+        return result;
+
+    }
+
+    private async Task<(KasAddressList, KasAddressList)> Execute(List<KasAddressList> address_lists, string type, CombineType comb_type,
         bool? exportUnused)
     {
         if (type == "difference") return await Difference(address_lists, comb_type, exportUnused);
         if (type == "union") return await Union(address_lists, comb_type, exportUnused);
         if (type == "intersection") return await Intersection(address_lists, comb_type, exportUnused);
         if (type == "symdiff") return await SymmetricDifference(address_lists, comb_type, exportUnused);
-
         return (null, null);
     }