修改了http服务器无法正确处理post请求入参；添加了modbus tcp客户端支持。

Serein.Script/SereinScriptExtension.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.Script
+{
+    internal static class SereinScriptExtension
+    { /// <summary>
+      ///  添加代码
+      /// </summary>
+      /// <param name="sb">字符串构建器</param>
+      /// <param name="retractCount">缩进次数（4个空格）</param>
+      /// <param name="code">要添加的代码</param>
+      /// <returns>字符串构建器本身</returns>
+        public static StringBuilder AppendCode(this StringBuilder sb,
+            int retractCount = 0,
+            string code = null,
+            bool isWrapping = true)
+        {
+            if (!string.IsNullOrWhiteSpace(code))
+            {
+                string retract = new string(' ', retractCount * 4);
+                sb.Append(retract);
+                if (isWrapping)
+                {
+                    sb.AppendLine(code);
+                }
+                else
+                {
+                    sb.Append(code);
+                }
+            }
+            return sb;
+        }
+    }
+}