Issue #226: Implemented two modes of lock ticks: LOCK_EVERY_TICK and LOCK_EVERY_CANDLE. Added event OnLockTicks

MtApi/MtLockTicksEventArgs.cs

@@ -0,0 +1,16 @@
+using System;
+
+namespace MtApi
+{
+    public class MtLockTicksEventArgs : EventArgs
+    {
+        internal MtLockTicksEventArgs(int expertHandle, string symbol)
+        {
+            ExpertHandle = expertHandle;
+            Symbol = symbol;
+        }
+
+        public int ExpertHandle { get; }
+        public string Symbol { get; }
+    }
+}