Issue #136: Updated structures MqlTick, MqlBook with new field volume_real. Remove redundant code from MtApiService.

MtApi5/Requests/RequestType.cs

@@ -15,6 +15,7 @@ namespace MtApi5.Requests
         SymbolInfoString    = 8,
         ChartTimePriceToXY  = 9,
         ChartXYToTimePrice  = 10,
-        PositionClose       = 11
+        PositionClose       = 11,
+        SymbolInfoTick      = 12
     }
 }

MtApi5/Requests/SymbolInfoTickRequest.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace MtApi5.Requests
+{
+    internal class SymbolInfoTickRequest : RequestBase
+    {
+        public override RequestType RequestType => RequestType.SymbolInfoTick;
+
+        public string SymbolName { get; set; }
+    }
+}