support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Shell/Standard/LOGFONT.cs

@@ -0,0 +1,26 @@
+namespace Standard
+{
+    using System;
+    using System.Runtime.InteropServices;
+
+    [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]
+    internal struct LOGFONT
+    {
+        public int lfHeight;
+        public int lfWidth;
+        public int lfEscapement;
+        public int lfOrientation;
+        public int lfWeight;
+        public byte lfItalic;
+        public byte lfUnderline;
+        public byte lfStrikeOut;
+        public byte lfCharSet;
+        public byte lfOutPrecision;
+        public byte lfClipPrecision;
+        public byte lfQuality;
+        public byte lfPitchAndFamily;
+        [MarshalAs(UnmanagedType.ByValTStr, SizeConst=0x20)]
+        public string lfFaceName;
+    }
+}
+