- Improvements to system calls

- system calls now async with await
- added start command to example
- added "handled" property to system call event args

TelegramBaseTest/Program.cs

@@ -21,13 +21,19 @@ namespace TelegramBaseTest
             bb.SystemCalls.Add("/start");
             bb.SystemCalls.Add("/form1");
             bb.SystemCalls.Add("/form2");
-
             bb.SystemCalls.Add("/params");
 
             bb.SystemCall += async (s, en) =>
             {
                 switch (en.Command)
                 {
+                    case "/start":
+
+                        var start = new Start();
+
+                        await en.Device.ActiveForm.NavigateTo(start);
+
+                        break;
                     case "/form1":
 
                         var form1 = new TestForm();
@@ -47,8 +53,10 @@ namespace TelegramBaseTest
                     case "/params":
 
                         String m = en.Parameters.DefaultIfEmpty("").Aggregate((a, b) => a + " and " + b);
+                        
+                        await en.Device.Send("Your parameters are: " + m, replyTo: en.Device.LastMessageId);
 
-                        await en.Device.Send("Your parameters are " + m, replyTo: en.Device.LastMessage);
+                        en.Handled = true;
 
                         break;
                 }