Issue #82: Refactored request responses (MtAp5). Added iCustom functions with string and boolean parameters. Added button iCustom in test application (MT5).

MtApi5/Requests/OrderSendResult.cs

@@ -0,0 +1,8 @@
+namespace MtApi5.Requests
+{
+    internal class OrderSendResult
+    {
+        public bool RetVal { get; set; }
+        public MqlTradeResult TradeResult { get; set; }
+    }
+}

MtApi5/Requests/Response.cs

@@ -0,0 +1,10 @@
+namespace MtApi5.Requests
+{
+    internal class Response<T>
+    {
+        public int ErrorCode { get; set; }
+        public string ErrorMessage { get; set; }
+
+        public T Value { get; set; }
+    }
+}