Use all saves in a folder to improve keys.

This PR adds an option in the breaking pane to scan a whole folder for saves. If a key for a save has been created using the normal breaking method has been created before, the save will be used to improve the keys, as is done when it is opened in the SAV tab.

This should be very useful for first time users that already have a lot of backups or previously used KeySav/Mass Dumper.