Added MtEvent into MtApiService. Added event LastTimeBar into MtApi (MT4)

MtApi/TimeBarArgs.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MtApi
+{
+    public class TimeBarArgs: EventArgs
+    {
+        public TimeBarArgs(MtTimeBar timeBar)
+        {
+            TimeBar = timeBar;
+        }
+
+        public MtTimeBar TimeBar { get; private set; }
+    }
+}