refactor<*>: rewrite all with AvaloniaUI

src/Views/About.axaml.cs

@@ -0,0 +1,39 @@
+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Interactivity;
+using System.Reflection;
+
+namespace SourceGit.Views {
+    public partial class About : Window {
+        public string Version {
+            get;
+            private set;
+        }
+
+        public About() {
+            var ver = Assembly.GetExecutingAssembly().GetName().Version;
+            Version = $"{ver.Major}.{ver.Minor}";
+            DataContext = this;
+            InitializeComponent();
+        }
+
+        private void CloseWindow(object sender, RoutedEventArgs e) {
+            Close();
+        }
+
+        private void OnVisitAvaloniaUI(object sender, PointerPressedEventArgs e) {
+            Native.OS.OpenBrowser("https://www.avaloniaui.net/");
+            e.Handled = true;
+        }
+
+        private void OnVisitAvaloniaEdit(object sender, PointerPressedEventArgs e) {
+            Native.OS.OpenBrowser("https://www.nuget.org/packages/OneWare.AvaloniaEdit");
+            e.Handled = true;
+        }
+
+        private void OnVisitJetBrainsMonoFont(object sender, PointerPressedEventArgs e) {
+            Native.OS.OpenBrowser("https://www.jetbrains.com/lp/mono/");
+            e.Handled = true;
+        }
+    }
+}