thruActivated as a property of the Transport layer (#148)

* thruActivated as a property of the Transport layer

* thruActivated defaults to true

Co-authored-by: lathoub <lathoub@gmail.com>

src/MIDI.hpp

@@ -94,7 +94,7 @@ void MidiInterface<Transport, Settings, Platform>::begin(Channel inChannel)
     mMessage.length  = 0;
 
     mThruFilterMode = Thru::Full;
-    mThruActivated  = true;
+    mThruActivated  = mTransport.thruActivated;
 }
 
 // -----------------------------------------------------------------------------

src/serialMIDI.h

@@ -51,6 +51,8 @@ public:
 	};
 
 public:
+    static const bool thruActivated = true;
+    
     void begin()
 	{
         // Initialise the Serial port