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/Atmos/Monitor/UI/AirAlarmWindow.xaml.cs

@@ -47,7 +47,7 @@ public sealed partial class AirAlarmWindow : FancyWindow
 
     private CheckBox _autoMode => AutoModeCheckBox;
 
-    public AirAlarmWindow(BoundUserInterface owner)
+    public AirAlarmWindow()
     {
         RobustXamlLoader.Load(this);
 
@@ -95,8 +95,11 @@ public sealed partial class AirAlarmWindow : FancyWindow
             _sensors.Clear();
             ResyncAllRequested!.Invoke();
         };
+    }
 
-        EntityView.SetEntity(owner.Owner);
+    public void SetEntity(EntityUid uid)
+    {
+        EntityView.SetEntity(uid);
     }
 
     public void UpdateState(AirAlarmUIState state)