Add shell context [WIP]

Wox/ShellContext/IEnumIDList.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace Wox.ShellContext
+{
+    [ComImport(),
+    Guid("000214F2-0000-0000-C000-000000000046"),
+    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    public interface IEnumIDList
+    {
+        [PreserveSig()]
+        uint Next(
+            uint celt,
+            out IntPtr rgelt,
+            out int pceltFetched);
+
+        void Skip(
+            uint celt);
+
+        void Reset();
+
+        IEnumIDList Clone();
+    }
+}