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/arch/MemoryCard/MemoryCardDriver.h

@@ -47,10 +47,13 @@ public:
 	virtual void Unmount( UsbStorageDevice* pDevice, CString sMountPoint ) = 0;
 	virtual void Flush( UsbStorageDevice* pDevice ) = 0;
 	virtual void ResetUsbStorage() = 0;
-	virtual void PauseMountingThread() = 0;
-	virtual void UnPauseMountingThread() = 0;
-	virtual void DoOsMount() = 0;
-	virtual void DontDoOsMount() = 0;
+	enum MountThreadState 
+	{
+		detect_and_mount,
+		detect_and_dont_mount,
+		paused
+	};
+	virtual void SetMountThreadState( MountThreadState mts ) = 0;
 };
 
 MemoryCardDriver *MakeMemoryCardDriver();