Upgrade Avalonia and FluentAvalonia, use a props file to sync versions

src/Artemis.UI/Screens/ProfileEditor/Panels/VisualEditor/VisualEditorView.axaml.cs

@@ -63,12 +63,7 @@ public partial class VisualEditorView : ReactiveUserControl<VisualEditorViewMode
     private void UpdateZoomBorderBackground()
     {
         if (ZoomBorder.Background is VisualBrush visualBrush)
-        {
             visualBrush.DestinationRect = new RelativeRect(ZoomBorder.OffsetX * -1, ZoomBorder.OffsetY * -1, 20, 20, RelativeUnit.Absolute);
-            // Workaround
-            // This fixes an issue where the container is not invalidated, which leaves behind a 'smear' since Avalonia 11 rc1, check if still required later
-            ZoomBorder.InvalidateVisual();
-        }
     }