support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Shell/Standard/Facility.cs

@@ -0,0 +1,19 @@
+namespace Standard
+{
+    using System;
+
+    internal enum Facility
+    {
+        Control = 10,
+        Dispatch = 2,
+        Ese = 0xe5e,
+        Itf = 4,
+        Null = 0,
+        Rpc = 1,
+        Storage = 3,
+        Win32 = 7,
+        WinCodec = 0x898,
+        Windows = 8
+    }
+}
+