UpdateSongPositions

It is useful to have Player SongPositions update off of ScreenGameplay
for use with things like ArrowEffects.

ScreenGameplay, ScreenHowToPlay, and ScreenEdit stop GameSoundManager
from running GameState:UpdateSongPosition and do it themselves, so this
has no impact on the screen classes that cared about, and thus updated,
player SongPositions.

src/ScreenEdit.cpp

@@ -1345,7 +1345,7 @@ void ScreenEdit::Update( float fDeltaTime )
 	{
 		RageTimer tm;
 		const float fSeconds = m_pSoundMusic->GetPositionSeconds( NULL, &tm );
-		GAMESTATE->UpdateSongPosition( fSeconds, GAMESTATE->m_pCurSong->m_SongTiming, tm, true );
+		GAMESTATE->UpdateSongPosition( fSeconds, GAMESTATE->m_pCurSong->m_SongTiming, tm );
 	}
 
 	if( m_EditState == STATE_RECORDING  )	
@@ -3037,7 +3037,7 @@ void ScreenEdit::TransitionEditState( EditState em )
 		/* Give a 1 second lead-in.  If we're loading Player, this must be done first.
 		 * Also be sure to get the right timing. */
 		float fSeconds = GetAppropriateTiming().GetElapsedTimeFromBeat( NoteRowToBeat(m_iStartPlayingAt) ) - 1;
-		GAMESTATE->UpdateSongPosition( fSeconds, GetAppropriateTiming(), RageZeroTimer, true );
+		GAMESTATE->UpdateSongPosition( fSeconds, GetAppropriateTiming(), RageZeroTimer );
 
 		GAMESTATE->m_bGameplayLeadIn.Set( false );