[Suggestion] Integrate with GOG to copy DRM-free games in library

[LoganJFisher]

Is your feature request related to a problem? Please describe.
Currently, taking a DRM-free game from GOG involves downloading it and manually copying the files over to my NAS. This is a slow process and requires a lot of manual labor.

Describe the solution you'd like
By integrating with GOG, a two options can be introduced:

1. Automatically download your entire library into the Gamevault backend's directory
2. Whenever you download a game from GOG onto a computer running the Gamevault frontend, have it automatically copy the files into the Gamevault backend's directory.

Describe alternatives you've considered
Continuing to do this manually.

Additional context
All games on GOG are DRM-free, so you won't even have to look for any sort of flags or anything.

[Alfagun74]

Duplicate of #331