update cache system

缓存系统支持后缀名存储方式

Assets/YooAsset/Runtime/CacheSystem/VerifyElement.cs

@@ -1,4 +1,5 @@
-
+using System.IO;
+
 namespace YooAsset
 {
 	internal class VerifyElement
@@ -21,5 +22,18 @@ namespace YooAsset
 			DataFilePath = dataFilePath;
 			InfoFilePath = infoFilePath;
 		}
+
+		public void DeleteFiles()
+		{
+			if (File.Exists(DataFilePath))
+			{
+				File.Delete(DataFilePath);
+			}
+
+			if (File.Exists(InfoFilePath))
+			{
+				File.Delete(InfoFilePath);
+			}
+		}
 	}
 }