added compatibility for MS-Windows and MidiProbe class

Lichtklavier.pro

@@ -23,6 +23,7 @@ SOURCES += \
     ColorScale.cpp \
     MainWindow.cpp \
     MidiListener.cpp \
+    MidiProbe.cpp \
     PianoKey.cpp \
     PianoKeyBoard.cpp \
     RtMidi.cpp \
@@ -35,6 +36,7 @@ HEADERS += \
     ColorScale.h \
     MainWindow.h \
     MidiListener.h \
+    MidiProbe.h \
     PianoKey.h \
     PianoKeyBoard.h \
     RtMidi.h \