Use a associative arrays instead of normal vectors to hold TapNotes.

More places NoteDataUtil, NoteDataWithScoring need to be converted to use the new row iteration macros.

stepmania/src/NotesLoaderBMS.cpp

@@ -115,9 +115,10 @@ static StepsType DetermineStepsType( int iPlayer, const NoteData &nd )
 	bool bTrackHasNote[NUM_BMS_TRACKS];
 	ZERO( bTrackHasNote );
 
+	int iLastRow = nd.GetLastRow();
 	for( int t=0; t<nd.GetNumTracks(); t++ )
 	{
-		for( int r=0; r<nd.GetNumRows(); r++ )
+		for( int r=0; r<=iLastRow; r++ )
 		{
 			if( nd.GetTapNoteX(t, r).type != TapNote::empty )
 			{