Add option to make a copy of the game folder before patching (console arcs, but also generally)

For all games, it would be nice to make a backup of the game, in case the installation fails, or just so the user can play either copy.

The user can do this manually, but adding a simple "make a copy of the game folder" option should be reasonably easy

If a user wants to restore their original version (to re-patch or otherwise), they need to manually delete the game and then re-download, then re-install it.

This is especially important for the Console arcs, which share chapter 4.

We should remember to remind users that steam sync won't work on the duplicate copy/steam won't launch the duplicate copy, and any other gotchas with the other copy.

Examinez le script principal du patcher pour comprendre comment il localise et modifie les dossiers du jeu. Identifiez où l'opération de copie doit se produire avant le début du patch. Vérifiez les opérations de fichiers existantes et la gestion des erreurs pour intégrer la logique de sauvegarde. Testez en appliquant un patch à un jeu pour vous assurer que la copie est créée et que l'original reste intact.

Rédigé par le modèle d'indexation à partir du texte de l'issue.