Initial commit of existing code.

* All renderdoc code up to this point was written by me, history is available by request

WinFormsUI/Docking/Helpers/Win32Helper.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Drawing;
+using System.Windows.Forms;
+
+namespace WeifenLuo.WinFormsUI.Docking
+{
+    public static class Win32Helper
+    {
+        private static readonly bool _isRunningOnMono = Type.GetType("Mono.Runtime") != null;
+
+        public static bool IsRunningOnMono { get { return _isRunningOnMono; } }
+
+        internal static Control ControlAtPoint(Point pt)
+        {
+            return Control.FromChildHandle(NativeMethods.WindowFromPoint(pt));
+        }
+
+        internal static uint MakeLong(int low, int high)
+        {
+            return (uint)((high << 16) + low);
+        }
+    }
+}