重构并增加HitTest

Spine/Interfaces/Attachments/IClippingAttachment.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Spine.Interfaces.Attachments
+{
+    public interface IClippingAttachment : IAttachment
+    {
+
+    }
+}