优化更新代码，添加界面功能并整合

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

@@ -0,0 +1,10 @@
+namespace ShrlAlgo.RvKits.RvIndependent.MetroGauges.LandXMLData
+{
+    public enum VolumeUnit
+    {
+        cubicMeter,
+        cubicInch,
+        cubicFoot,
+        cubicYard
+    }
+}