Gravity generator rewrite (#4828)

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Client/UserInterface/FancyWindow.xaml.cs

@@ -0,0 +1,30 @@
+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface.CustomControls;
+using Robust.Client.UserInterface.XAML;
+using Robust.Shared.Maths;
+
+namespace Content.Client.UserInterface
+{
+    [GenerateTypedNameReferences]
+    public partial class FancyWindow : BaseWindow
+    {
+        public FancyWindow()
+        {
+            RobustXamlLoader.Load(this);
+
+            CloseButton.OnPressed += _ => Close();
+            XamlChildren = ContentsContainer.Children;
+        }
+
+        public string? Title
+        {
+            get => WindowTitle.Text;
+            set => WindowTitle.Text = value;
+        }
+
+        protected override DragMode GetDragModeFor(Vector2 relativeMousePos)
+        {
+            return DragMode.Move;
+        }
+    }
+}