support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Expression/Media/IArcGeometrySourceParameters.cs

@@ -0,0 +1,13 @@
+namespace HandyControl.Expression.Media
+{
+    public interface IArcGeometrySourceParameters : IGeometrySourceParameters
+    {
+        double ArcThickness { get; }
+
+        UnitType ArcThicknessUnit { get; }
+
+        double EndAngle { get; }
+
+        double StartAngle { get; }
+    }
+}