Print a custom attribute's positional arguments.

ICSharpCode.Decompiler/Ast/AstBuilder.cs

@@ -578,10 +578,14 @@ namespace Decompiler
 				foreach (var customAttribute in customAttributeProvider.CustomAttributes)
 				{
 					ICSharpCode.NRefactory.CSharp.Attribute attribute = new ICSharpCode.NRefactory.CSharp.Attribute();
-					//customAttribute.
 					attribute.Type = ConvertType(customAttribute.AttributeType);
 					section.Attributes.Add(attribute);
 
+					foreach (var parameter in customAttribute.ConstructorArguments)
+					{
+						attribute.Arguments.Add(new PrimitiveExpression(parameter.Value));
+					}
+
 				}
 
 				attributedNode.Attributes.Add(section);

ICSharpCode.Decompiler/Tests/CustomAttributes.cs

@@ -9,7 +9,11 @@ public static class CustomAtributes
 	[Flags]
 	public enum EnumWithFlag
 	{
-		Item1,
+//		Item1,
 		Item2
 	}
+	[Obsolete("some message")]
+	public static void ObsoletedMethod()
+	{
+	}
 }

NRefactory/ICSharpCode.NRefactory/CSharp/Ast/GeneralScope/Attribute.cs

@@ -25,12 +25,14 @@
 // THE SOFTWARE.
 
 using System.Collections.Generic;
+using System.Diagnostics;
 
 namespace ICSharpCode.NRefactory.CSharp
 {
 	/// <summary>
 	/// Attribute(Arguments)
 	/// </summary>
+	[DebuggerDisplay("Attribute {Type}")]
 	public class Attribute : AstNode
 	{
 		public override NodeType NodeType {