moved GUI project to a subdirectory.

GUI/ArcParameters.xaml.cs

@@ -0,0 +1,22 @@
+using System.Windows;
+
+namespace GARbro.GUI
+{
+    /// <summary>
+    /// Interaction logic for ArcParameters.xaml
+    /// </summary>
+    public partial class ArcParametersDialog : Window
+    {
+        public ArcParametersDialog (UIElement widget, string notice)
+        {
+            InitializeComponent();
+            this.WidgetPane.Children.Add (widget);
+            this.Notice.Text = notice;
+        }
+
+        private void Button_Click (object sender, RoutedEventArgs e)
+        {
+            DialogResult = true;
+        }
+    }
+}