Migrate desktop app to Avalonia and publish cross-platform releases

Program.cs

@@ -1,19 +1,18 @@
-using kcsj.Forms;
+using Avalonia;
 
-namespace kcsj
+namespace kcsj;
+
+internal static class Program
 {
-    internal static class Program
+    [STAThread]
+    public static void Main(string[] args)
     {
-        /// <summary>
-        ///  The main entry point for the application.
-        /// </summary>
-        [STAThread]
-        static void Main()
-        {
-            // To customize application configuration such as set high DPI settings or default font,
-            // see https://aka.ms/applicationconfiguration.
-            ApplicationConfiguration.Initialize();
-            Application.Run(new Forms.MainForm());
-        }
+        BuildAvaloniaApp().StartWithClassicDesktopLifetime(args);
     }
-}
+
+    public static AppBuilder BuildAvaloniaApp() =>
+        AppBuilder.Configure<App>()
+            .UsePlatformDetect()
+            .WithInterFont()
+            .LogToTrace();
+}