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.

Examine el script principal del parcheador para comprender cómo localiza y modifica las carpetas del juego. Identifique dónde debe ocurrir la operación de copia antes de que comience la aplicación de parches. Revise las operaciones de archivo existentes y el manejo de errores para integrar la lógica de respaldo. Pruebe aplicando un parche a un juego para asegurarse de que se crea la copia y el original permanece intacto.

Escrito por el modelo de indexación a partir del texto del issue.