结构大修改，改成朴实无华的结构，不过度架构。能跑就行

Assets/Scripts/NBC/Asset/Editor/Builder/Tasks/CopyToStreamingAssets.cs

@@ -0,0 +1,24 @@
+using System.IO;
+using UnityEditor;
+using UnityEditor.EditorTools;
+using UnityEngine;
+
+namespace NBC.Asset.Editor
+{
+    [Id(TaskId.CopyToStreamingAssets)]
+    public class CopyToStreamingAssets : BuildTask
+    {
+        public override void Run(BuildContext context)
+        {
+            var last = HistoryUtil.GetLastVersionHistory();
+            if (last != null)
+            {
+                last.CopyToStreamingAssets();
+            }
+            else
+            {
+                Debug.LogError("copy version is null,version history is null");
+            }
+        }
+    }
+}