clean up memory card logic:

- Don't do the OS mount for cards during the attract screens.  Only do OS mounts in the time between BeginGame and PlayersFinalized.
 - Remove logic for fast load of a Profile from the MemoryCard.  Instead, load the whole profile all at once on PlayersFinalized.

stepmania/src/MemoryCardManager.h

@@ -38,7 +38,7 @@ public:
 	CString GetName( PlayerNumber pn ) const;
 
 protected:
-	void AssignUnassignedCards();	// do our best to assign a Device to each player
+	void UpdateUnassignedCards();	// do our best to assign a Device to each player
 
 	MemoryCardDriver *m_pDriver;