Add code to decode OS/2 monochrome icons and pointers, and a separate Icon Viewer for debugging.

iconviewer/iconviewer.Desktop/Program.cs

@@ -0,0 +1,15 @@
+using System;
+using Eto.Forms;
+using Eto.Drawing;
+
+namespace iconviewer.Desktop
+{
+    class Program
+    {
+        [STAThread]
+        static void Main(string[] args)
+        {
+            new Application(Eto.Platform.Detect).Run(new MainForm());
+        }
+    }
+}