Implement options splitting

There are several cosmetic problems with this; working on fixes ...

stepmania/src/ScreenOptions.h

@@ -66,6 +66,7 @@ protected:
 	void PositionIcons();
 	void RefreshIcons();
 	void PositionCursors();
+	void PositionItems();
 	void TweenCursor( PlayerNumber player_no );
 	void UpdateText( PlayerNumber player_no );
 	void UpdateEnabledDisabled();
@@ -107,6 +108,10 @@ private:
 
 	bool m_bRowIsLong[MAX_OPTION_LINES];	// goes off edge of screen
 
+	/* True if the item is off of the screen. */
+	bool m_bRowIsHidden[MAX_OPTION_LINES];
+	float m_fRowY[MAX_OPTION_LINES];
+
 	int m_iCurrentRow[NUM_PLAYERS];
 
 	OptionsCursor	m_Underline[NUM_PLAYERS][MAX_OPTION_LINES];