On life change, send a message. Remove the duplicate code

from ScoreDisplayLifeTime; actors can catch the message
if they want to do things like this.

stepmania/src/ScoreDisplayLifeTime.h

@@ -21,8 +21,6 @@ public:
 	virtual void OnJudgment( HoldNoteScore score, TapNoteScore tscore );
 
 protected:
-	void PlayGainLoss( const RString &sCommand, float fDeltaLifeSecs );
-
 	AutoActor	m_sprFrame;
 	BitmapText	m_textTimeRemaining;
 	BitmapText	m_textDeltaSeconds;