TEngine全面更新，升级YooAsset2.1.1、UniTask、UIWindow、I2Localization

TEngine全面更新，升级YooAsset2.1.1、UniTask、UIWindow、I2Localization

UnityProject/Packages/YooAsset/Runtime/DownloadSystem/DownloadStatus.cs

@@ -0,0 +1,36 @@
+
+namespace YooAsset
+{
+    public struct DownloadStatus
+    {
+        /// <summary>
+        /// 下载是否完成
+        /// </summary>
+        public bool IsDone;
+
+        /// <summary>
+        /// 下载进度（0f~1f）
+        /// </summary>
+        public float Progress;
+
+        /// <summary>
+        /// 需要下载的总字节数
+        /// </summary>
+        public ulong TotalBytes;
+
+        /// <summary>
+        /// 已经下载的字节数
+        /// </summary>
+        public ulong DownloadedBytes;
+
+        public static DownloadStatus CreateDefaultStatus()
+        {
+            DownloadStatus status = new DownloadStatus();
+            status.IsDone = false;
+            status.Progress = 0f;
+            status.TotalBytes = 0;
+            status.DownloadedBytes = 0;
+            return status;
+        }
+    }
+}