Backup awareness

[Booplicate]

This makes Monika "aware" of when the user restores a backup.
A few reasons why:

• awareness is always cool, can catch people by surprise
• this also fixes an issue when loading a very old backup and losing affection for it
• sometimes it's not clear enough that a backup has been restored, this is a good way to tell the player "something happened"

Testing

• verify the main logic works:
• • make sure you have persistent in your save dir
• • • if not, load in and quit to quickly generate a fresh pers
• • load in with the new changes
• • you should get a new backup in your save dir
• • quit normally
• • restore the new backup
• • verify Monika mentions that you restored a backup
• • restart again, verify Monika doesn't mentions it again (the flag should be reset)
• verify no aff lose when loading an old backup
• verify expressions and writing are good
• • also check out post expressions
• verify I didn't leave more persisten fypos...