clear out nerv/serialized data from notedata upon init and leave myself a relatively important note

Author: MinaciousGrace

src/NoteData.cpp

@@ -17,6 +17,9 @@ REGISTER_CLASS_TRAITS( NoteData, new NoteData(*pCopy) )
 
 void NoteData::Init()
 {
+	UnsetNerv();
+	UnsetSerializedNoteData();
+	UnsetSerializedNoteData2();
 	m_TapNotes = vector<TrackMap>();	// ensure that the memory is freed
 }
 

src/Steps.cpp

@@ -378,6 +378,8 @@ void Steps::CalcEtternaMetadata() {
 		//MinaCalc2(stuffnthings, GetNoteData().SerializeNoteData2(etaner), 1.f, 0.93f);
 
 	ChartKey = GenerateChartKey(*m_pNoteData, GetTimingData());
+
+	// need to figure out a better place to put this as it is fairly slow
 	for (unsigned i = 0; i < std::thread::hardware_concurrency(); ++i)
 		SONGMAN->keyconversionmap.emplace(GenerateBustedChartKey(*m_pNoteData, GetTimingData(), i), ChartKey);