support noteskin-changing attacks

cache trick icons
change AI probability format

stepmania/src/PlayerOptions.h

@@ -77,7 +77,8 @@ struct PlayerOptions
 	bool		m_bTimingAssist;
 	float		m_fPerspectiveTilt;		// -1 = near, 0 = overhead, +1 = space
 	bool		m_bTimeSpacing;	// instead of Beat spacing
-
+	CString		m_sPositioning;	/* The current positioning mode, or empty to use the normal positions. */
+	CString		m_sNoteSkin;
 
 	void NextAccel();
 	void NextEffect();