Replace forward declaration with include NoteData.h

src/ColumnCues.cpp

@@ -1,7 +1,6 @@
 #include "global.h"
 #include "ColumnCues.h"
 #include "GameState.h"
-#include "NoteData.h"
 #include "TimingData.h"
 
 void ColumnCue::CalculateColumnCues(const NoteData &in, std::vector<ColumnCue> &out, float minDuration)

src/ColumnCues.h

@@ -3,8 +3,7 @@
 
 #include "GameConstantsAndTypes.h"
 #include "NoteTypes.h"
-
-class NoteData;
+#include "NoteData.h"
 
 /* ColumnCues are used to indicate to the player which column the next note will occur
  after a long gap in the stepchart.