fix(core): Removes disposable netstates. (#467)

- [X] Removes IDisposable from NetState
- [X] Swaps Disconnect and Dispose methods

Projects/UOContent/Misc/ClientVerification.cs

@@ -172,7 +172,7 @@ namespace Server.Misc
             if (ns.Connection != null)
             {
                 ns.WriteConsole("Disconnecting, bad version");
-                ns.Dispose();
+                ns.Disconnect();
             }
         }