Issue #290: provide information about Period (Timeframe) in event Mt5TimeBar

MtApi5/Mt5TimeBarArgs.cs

@@ -4,15 +4,17 @@ namespace MtApi5
 {
     public class Mt5TimeBarArgs: EventArgs
     {
-        internal Mt5TimeBarArgs(int expertHandle, string symbol, MqlRates rates)
+        internal Mt5TimeBarArgs(int expertHandle, string symbol, ENUM_TIMEFRAMES timeframe, MqlRates rates)
         {
             ExpertHandle = expertHandle;
             Rates = rates;
             Symbol = symbol;
+            Timeframe = timeframe;
         }
 
         public int ExpertHandle { get; }
         public string Symbol { get; }
+        public ENUM_TIMEFRAMES Timeframe { get; }
         public MqlRates Rates { get; }
     }
 }

MtApi5/MtApi5Client.cs

@@ -3546,7 +3546,7 @@ namespace MtApi5
             var e = JsonConvert.DeserializeObject<OnLastTimeBarEvent>(payload);
             if (e == null || string.IsNullOrEmpty(e.Instrument) || e.Rates == null)
                 return;
-            OnLastTimeBar?.Invoke(this, new Mt5TimeBarArgs(expertHandle, e.Instrument, e.Rates));
+            OnLastTimeBar?.Invoke(this, new Mt5TimeBarArgs(expertHandle, e.Instrument, e.Timeframe, e.Rates));
         }
 
         private void ReceivedOnLockTicksEvent(int expertHandle, string payload)

MtApi5/MtProtocol/OnLastTimeBarEvent.cs

@@ -4,6 +4,7 @@
     {
         public MqlRates? Rates { get; set; }
         public string? Instrument { get; set; }
+        public ENUM_TIMEFRAMES Timeframe { get; set; }
         public int ExpertHandle { get; set; }
     }
 }