Explicitly cache #PEAKNPS instead of deriving it from NPSPerMeasure.

src/NotesWriterSSC.cpp

@@ -465,6 +465,9 @@ static RString GetSSCNoteData( const Song &song, const Steps &in, bool bSavingCa
 		
 		lines.push_back( ssprintf( "#NOTESPERMEASURE:%s;", join("|",notesPerMeasureStrings).c_str() ) );
 		
+		const std::vector<float> &peakNps = in.GetAllPeakNps();
+		lines.push_back("#PEAKNPS:" + serialize(peakNps, "|", 3) + ";");
+		
 		// NOTE(MV): #STEPFILENAME has to be at the end of the cache tags,
 		// because it's used in SSCLoader::LoadFromSimfile to determine when
 		// to switch the state back to GETTING_SONG_INFO, which means any tags