feat (RateModsAffectFGChanges): Actually implemented

I'm trying to transfer the nITG implementation for now

src/Background.cpp

@@ -730,7 +730,7 @@ void BackgroundImpl::Layer::UpdateCurBGChange( const Song *pSong, float fLastMus
 	pSong->m_SongTiming.GetBeatAndBPSFromElapsedTime(beat_info);
 
 	// Calls to Update() should *not* be scaled by music rate; fCurrentTime is. Undo it.
-	const float fRate = GAMESTATE->m_SongOptions.GetCurrent().m_fMusicRate;
+	const float fRate = PREFSMAN->m_bRateModsAffectTweens ? 1.0f : GAMESTATE->m_SongOptions.GetCurrent().m_fMusicRate;
 
 	// Find the BGSegment we're in
 	const int i = FindBGSegmentForBeat(beat_info.beat);

src/Foreground.cpp

@@ -73,7 +73,7 @@ void Foreground::LoadFromSong( const Song *pSong )
 void Foreground::Update( float fDeltaTime )
 {
 	// Calls to Update() should *not* be scaled by music rate. Undo it.
-	const float fRate = GAMESTATE->m_SongOptions.GetCurrent().m_fMusicRate;
+	const float fRate = PREFSMAN->m_bRateModsAffectTweens ? 1.0f : GAMESTATE->m_SongOptions.GetCurrent().m_fMusicRate;
 
 	for( unsigned i=0; i < m_BGAnimations.size(); ++i )
 	{

src/PlayerOptions.cpp

@@ -111,8 +111,10 @@ void PlayerOptions::Init()
 
 void PlayerOptions::Approach( const PlayerOptions& other, float fDeltaSeconds )
 {
+	const float fRateMult = PREFSMAN->m_bRateModsAffectTweens ? GAMESTATE->m_SongOptions.GetCurrent().m_fMusicRate : 1.0f;
+
 #define APPROACH( opt ) \
-	fapproach( m_ ## opt, other.m_ ## opt, fDeltaSeconds * other.m_Speed ## opt );
+	fapproach( m_ ## opt, other.m_ ## opt, fRateMult * fDeltaSeconds * other.m_Speed ## opt );
 #define DO_COPY( x ) \
 	x = other.x;
 

src/ScreenEdit.cpp

@@ -1651,6 +1651,8 @@ void ScreenEdit::Update( float fDeltaTime )
 {
 	m_PlayerStateEdit.Update( fDeltaTime );
 
+	const float fRate = PREFSMAN->m_bRateModsAffectTweens ? GAMESTATE->m_SongOptions.GetCurrent().m_fMusicRate : 1.0f;
+
 	if( m_pSoundMusic->IsPlaying() )
 	{
 		RageTimer tm;
@@ -1755,7 +1757,14 @@ void ScreenEdit::Update( float fDeltaTime )
 	}
 
 	//LOG->Trace( "ScreenEdit::Update(%f)", fDeltaTime );
+	if( m_EditState == STATE_PLAYING )
+	{
+		ScreenWithMenuElements::Update( fDeltaTime * fRate );
+	}
+	else
+	{
 		ScreenWithMenuElements::Update( fDeltaTime );
+	}
 
 
 	// Update trailing beat

src/ScreenGameplay.cpp

@@ -1701,7 +1701,8 @@ void ScreenGameplay::Update( float fDeltaTime )
 	}
 	else
 	{
-		Screen::Update( fDeltaTime );
+		const float fRate = PREFSMAN->m_bRateModsAffectTweens ? GAMESTATE->m_SongOptions.GetCurrent().m_fMusicRate : 1.0f;
+		Screen::Update( fDeltaTime * fRate );
 	}
 
 	/* This happens if ScreenDemonstration::HandleScreenMessage sets a new screen when