fix: Fixes edge cases with on off items (#1832)

### Summary
- Generalizes the On/Off toggle items concept
- Updates the OnOffGump so it is static
- Standardizes OnOff items so they can be used by staff


### Notes
Decided to not fix #1417 because it is not clear that the clilocs or errors are for that purpose. Can't test this on OSI anyways.

Projects/UOContent/Items/Misc/GumpToggleItems.cs

@@ -0,0 +1,75 @@
+using Server.Gumps;
+using Server.Network;
+
+namespace Server.Items;
+
+public interface IGumpToggleItem
+{
+    public bool IsLockedDown { get; }
+    public bool TurnedOn { get; set; }
+}
+
+public sealed class TurnOnGump : TurnOnOffGump<TurnOnGump>
+{
+    public TurnOnGump(IGumpToggleItem item) : base(item)
+    {
+    }
+
+    protected override void BuildLayout(ref StaticGumpBuilder builder)
+    {
+        base.BuildLayout(ref builder);
+
+        builder.AddHtmlLocalized(45, 20, 300, 35, 1011034); // Activate this item
+    }
+}
+
+public sealed class TurnOffGump : TurnOnOffGump<TurnOffGump>
+{
+    public TurnOffGump(IGumpToggleItem item) : base(item)
+    {
+    }
+
+    protected override void BuildLayout(ref StaticGumpBuilder builder)
+    {
+        base.BuildLayout(ref builder);
+
+        builder.AddHtmlLocalized(45, 20, 300, 35, 1011035); // Deactivate this item
+    }
+}
+
+public abstract class TurnOnOffGump<T> : StaticGump<T> where T : TurnOnOffGump<T>
+{
+    protected readonly IGumpToggleItem _item;
+
+    public TurnOnOffGump(IGumpToggleItem item) : base(150, 200) => _item = item;
+
+    protected override void BuildLayout(ref StaticGumpBuilder builder)
+    {
+        builder.AddBackground(0, 0, 300, 150, 0xA28);
+
+        builder.AddButton(40, 53, 0xFA5, 0xFA7, 1);
+        builder.AddHtmlLocalized(80, 55, 65, 35, 1011036); // OKAY
+
+        builder.AddButton(150, 53, 0xFA5, 0xFA7, 0);
+        builder.AddHtmlLocalized(190, 55, 100, 35, 1011012); // CANCEL
+    }
+
+    public override void OnResponse(NetState sender, in RelayInfo info)
+    {
+        var from = sender.Mobile;
+
+        if (info.ButtonID != 1)
+        {
+            from.SendLocalizedMessage(502694); // Cancelled action.
+            return;
+        }
+
+        var newValue = !_item.TurnedOn;
+        _item.TurnedOn = newValue;
+
+        if (newValue && !_item.IsLockedDown)
+        {
+            from.SendLocalizedMessage(502693); // Remember, this only works when locked down.
+        }
+    }
+}