重构并增加HitTest

Spine/Interfaces/ISkin.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Spine.Interfaces
+{
+    public interface ISkin
+    {
+        /// <summary>
+        /// 皮肤名字
+        /// </summary>
+        public string Name { get; }
+
+        /// <summary>
+        /// 添加其他皮肤
+        /// </summary>
+        public void AddSkin(ISkin skin);
+
+        /// <summary>
+        /// 清空皮肤内容
+        /// </summary>
+        public void Clear();
+    }
+}