修改锚点窗口对entry类的依赖，现在可以自行通过泛型扩展。

Runtime/VisualForm/IAnchorWindowEntry.cs

@@ -0,0 +1,33 @@
+using System.Collections.Generic;
+
+namespace XericUI.VisualForm
+{
+    public interface IAnchorWindowEntry
+    {
+        /// <summary>
+        /// 默认窗口条目列表
+        /// </summary>
+        public IEnumerable<WindowEntry> DefaultTypeWindowEntries { get; }
+
+        /// <summary>
+        /// 默认窗口条目数量
+        /// </summary>
+        public int DefaultTypeWindowEntriesCount { get; }
+
+        /// <summary>
+        /// 窗口层级变更事件 — 当某个条目的溢出状态发生变化时触发。
+        /// </summary>
+        /// <param name="entryIndex">发生变化的条目索引</param>
+        /// <param name="state">新的溢出状态</param>
+        public void OnWindowLevelChange(int entryIndex, OverflowState state);
+    }
+
+    public interface IAnchorWindowEntry<T> : IAnchorWindowEntry
+        where T : WindowEntry
+    {
+        /// <summary>
+        /// 窗口条目列表
+        /// </summary>
+        public IList<T> WindowEntries { get; }
+    }
+}