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/Server.Tests/Fixtures/ServerFixture.cs

@@ -1,7 +1,5 @@
 using System;
-using System.Diagnostics;
 using System.Reflection;
-using System.Threading;
 
 namespace Server.Tests;