ui(client): migrate to AvaloniaUI

ModpackUpdater.Apps.Client.Gui/App.axaml.cs

@@ -0,0 +1,20 @@
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+
+namespace ModpackUpdater.Apps.Client.Gui;
+
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+            desktop.MainWindow = new MainForm();
+        base.OnFrameworkInitializationCompleted();
+    }
+}