Issue #96: Implemented function PositionGetTicket in MtApi (MT5)

MtApi5/Mt5CommandType.cs

@@ -9,7 +9,6 @@ namespace MtApi5
         //OrderSend                           = 1,
         OrderCalcMargin                     = 2,
         OrderCalcProfit                     = 3,
-        //OrderCheck                          = 4,
         //OrderSendAsync                      = 5,
         PositionsTotal                      = 6,
         PositionGetSymbol                   = 7,
@@ -17,6 +16,7 @@ namespace MtApi5
         PositionGetDouble                   = 9,
         PositionGetInteger                  = 10,
         PositionGetString                   = 11,
+        PositionGetTicket                   = 4,
         OrdersTotal                         = 12,
         OrderGetTicket                      = 13,
         OrderSelect                         = 14,

MtApi5/MtApi5Client.cs

@@ -280,6 +280,17 @@ namespace MtApi5
             return SendCommand<string>(Mt5CommandType.PositionGetString, commandParameters);
         }
 
+        ///<summary>
+        ///The function returns the ticket of a position with the specified index in the list of open positions and automatically selects the position to work with using functions PositionGetDouble, PositionGetInteger, PositionGetString.
+        ///</summary>
+        ///<param name="index">Identifier of a position property.</param>
+        public ulong PositionGetTicket(int index)
+        {
+            var commandParameters = new ArrayList { index };
+
+            return SendCommand<ulong>(Mt5CommandType.PositionGetTicket, commandParameters);
+        }
+
         ///<summary>
         ///Returns the number of current orders.
         ///</summary>