Too many changes:

- added FirmataSession class, this is a light version of ArduinoSession, that has better firmata message handling, doesn't use a queue. so can be used for Arduinos that constantly produce a shitload of messages without overflowing the queue.
- added System.IO.Ports.Mono, replaces the crappy Microsoft SerialPort implementation as that one uses too much cpu, threads and memory, see dotnet/runtime#2379
- extended the test program with some additional tests, like a raw dump of all incoming bytes for Arduinos that produce data autonomously. Also you can choose which serial port to use.
- code refactoring, replaced magic numbers with enums.

Solid.Arduino.Core.Run/ConsoleLogger.cs

@@ -41,5 +41,41 @@ public void Fatal(string message, params object[] args)
     {
       Console.WriteLine("FATAL: " + message, args);
     }
+
+    public void Debug(Exception exception, string message, params object[] args)
+    {
+      Debug(message, args);
+      Console.WriteLine(exception);
+    }
+
+    public void Trace(Exception exception, string message, params object[] args)
+    {
+      Trace(message, args);
+      Console.WriteLine(exception);
+    }
+
+    public void Info(Exception exception, string message, params object[] args)
+    {
+      Info(message, args);
+      Console.WriteLine(exception);
+    }
+
+    public void Warn(Exception exception, string message, params object[] args)
+    {
+      Warn(message, args);
+      Console.WriteLine(exception);
+    }
+
+    public void Error(Exception exception, string message, params object[] args)
+    {
+      Error(message, args);
+      Console.WriteLine(exception);
+    }
+
+    public void Fatal(Exception exception, string message, params object[] args)
+    {
+      Fatal(message, args);
+      Console.WriteLine(exception);
+    }
   }
 }