Remove some BUI boilerplate (#28399)

* Remove some BUI boilerplate

- The disposals overrides got removed due to the helper method handling it.
- Replace window creation with CreateWindow helper.
- Fixed some stinky code which would cause exceptions.

* More

* moar

* weh

* done

* More BUIs

* More updates

* weh

* moar

* look who it is

* weh

* merge

* weh

* fixes

Content.Client/MachineLinking/UI/SignalTimerBoundUserInterface.cs

@@ -1,5 +1,6 @@
 using Content.Shared.MachineLinking;
 using Robust.Client.GameObjects;
+using Robust.Client.UserInterface;
 using Robust.Shared.Timing;
 
 namespace Content.Client.MachineLinking.UI;
@@ -19,19 +20,14 @@ public sealed class SignalTimerBoundUserInterface : BoundUserInterface
     {
         base.Open();
 
-        _window = new SignalTimerWindow(this);
-
-        if (State != null)
-            UpdateState(State);
-
-        _window.OpenCentered();
-        _window.OnClose += Close;
+        _window = this.CreateWindow<SignalTimerWindow>();
+        _window.OnStartTimer += StartTimer;
         _window.OnCurrentTextChanged += OnTextChanged;
         _window.OnCurrentDelayMinutesChanged += OnDelayChanged;
         _window.OnCurrentDelaySecondsChanged += OnDelayChanged;
     }
 
-    public void OnStartTimer()
+    public void StartTimer()
     {
         SendMessage(new SignalTimerStartMessage());
     }
@@ -48,11 +44,6 @@ public sealed class SignalTimerBoundUserInterface : BoundUserInterface
         SendMessage(new SignalTimerDelayChangedMessage(_window.GetDelay()));
     }
 
-    public TimeSpan GetCurrentTime()
-    {
-        return _gameTiming.CurTime;
-    }
-
     /// <summary>
     /// Update the UI state based on server-sent info
     /// </summary>
@@ -72,11 +63,4 @@ public sealed class SignalTimerBoundUserInterface : BoundUserInterface
         _window.SetTimerStarted(cast.TimerStarted);
         _window.SetHasAccess(cast.HasAccess);
     }
-
-    protected override void Dispose(bool disposing)
-    {
-        base.Dispose(disposing);
-        if (!disposing) return;
-        _window?.Dispose();
-    }
 }