优化更新代码，添加界面功能并整合

ShrlAlgo.RvKits/RvIndependent/MetroGauges/LandXMLData/DesignSpeed.cs

@@ -0,0 +1,21 @@
+using System.Xml.Serialization;
+
+namespace ShrlAlgo.RvKits.RvIndependent.MetroGauges.LandXMLData
+{
+    [XmlType("DesignSpeed")]
+    [Serializable]
+    public class DesignSpeed
+    {
+        [XmlAttribute("staStart")]
+        public double staStart { get; set; }
+
+        [XmlAttribute("speed")]
+        public double speed { get; set; }
+
+        [XmlAttribute("speedNumber")]
+        public int speedNumber { get; set; }
+
+        [XmlAttribute("comment")]
+        public string comment { get; set; }
+    }
+}