support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Data/Enum/TitleAlignment.cs

@@ -0,0 +1,12 @@
+
+namespace HandyControl.Data
+{
+    /// <summary>
+    ///     标题对齐方式
+    /// </summary>
+    public enum TitleAlignment
+    {
+        Left,
+        Top
+    }
+}