add simple installer/uninstaller

ServerSelector/Views/MainView.axaml.cs

@@ -0,0 +1,37 @@
+using Avalonia.Controls;
+using System;
+using System.Runtime.InteropServices;
+using System.Security.Principal;
+
+namespace ServerSelector.Views;
+
+public partial class MainView : UserControl
+{
+    public MainView()
+    {
+        InitializeComponent();
+        CmbServerSelection.SelectedIndex = ServerSwitcher.IsUsingOfficalServer() ? 0 : 1;
+    }
+
+    private void Save_Click(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
+    {
+        try
+        {
+            ServerSwitcher.SaveCfg(CmbServerSelection.SelectedIndex == 0, txtGamePath.Text, txtLauncherPath.Text);
+        }
+        catch(Exception ex)
+        {
+            ShowWarningMsg("Failed to save configuration: " + ex.ToString(), "Error");
+        }
+    }
+
+    // for some stupid reason avalonia does not support message boxes.
+
+    [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
+    public static extern int MessageBox(IntPtr hWnd, String text, String caption, uint type);
+
+    public static void ShowWarningMsg(string text, string title)
+    {
+        MessageBox(IntPtr.Zero, text, title, 0x00000030);
+    }
+}