[chore:] used_plz at KasPerson for the plz used in the final address)

DataStore/DataStructures.cs

@@ -178,6 +178,23 @@ public class KasPerson
     public string abteilung { get; set; }
     public string funktionad { get; set; }
 
+    public string used_plz { get; set; } = "";
+
+    public static void SetUsedPLZ(int id, string plz)
+    {
+        foreach (var set in Settings._instance.addressSets.addresses)
+        {
+            foreach (var add in set.KasPersons)
+            {
+                if (add.id == id)
+                {
+                    add.used_plz = plz;
+                    return;
+                }
+            }
+        }
+    }
+
     public static int GenerateNewID(int base_id)
     {
         //var newid = 100000 + base_id;