support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Shell/Standard/SHFILEOPSTRUCT.cs

@@ -0,0 +1,22 @@
+namespace Standard
+{
+    using System;
+    using System.Runtime.InteropServices;
+
+    [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode, Pack=1)]
+    internal struct SHFILEOPSTRUCT
+    {
+        public IntPtr hwnd;
+        [MarshalAs(UnmanagedType.U4)]
+        public Standard.FO wFunc;
+        public string pFrom;
+        public string pTo;
+        [MarshalAs(UnmanagedType.U2)]
+        public Standard.FOF fFlags;
+        [MarshalAs(UnmanagedType.Bool)]
+        public int fAnyOperationsAborted;
+        public IntPtr hNameMappings;
+        public string lpszProgressTitle;
+    }
+}
+