add ability to throw nonfatal errors in the map importer, and display them.

OpenRA.Editor/ErrorListDialog.cs

@@ -0,0 +1,25 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made 
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System.Collections.Generic;
+using System.Windows.Forms;
+
+namespace OpenRA.Editor
+{
+	public partial class ErrorListDialog : Form
+	{
+		public ErrorListDialog( IEnumerable<string> errors )
+		{
+			InitializeComponent();
+			foreach (var e in errors)
+				listBox1.Items.Add(e);
+		}
+	}
+}