"misc" view now shows the model state, of the track use of master pitch (#3753)

[cherry-picked from master]

include/InstrumentMidiIOView.h

@@ -72,6 +72,11 @@ public:
 	InstrumentMiscView( InstrumentTrack *it, QWidget* parent );
 	~InstrumentMiscView();
 
+	GroupBox * pitchGroupBox()
+	{
+		return m_pitchGroupBox;
+	}
+
 private:
 
 	GroupBox * m_pitchGroupBox;

include/InstrumentTrack.h

@@ -27,6 +27,7 @@
 #define INSTRUMENT_TRACK_H
 
 #include "AudioPort.h"
+#include "GroupBox.h"
 #include "InstrumentFunctions.h"
 #include "InstrumentSoundShaping.h"
 #include "MidiEventProcessor.h"