[REQUEST] Parsing of GOG games installed directly instead of via GOG Galaxy

[HazardousBackup]

• Feature information

  GOG provides for users to be able to download installers directly without using GOG Galaxy. So I suggest adding a parser or modifying the GOG parser to allow for parsing GOG games when GOG Galaxy is not installed.

• Additional context

  As far as I can tell, all GOG games installed via their normal installers (possibly when installed via Galaxy as well) add a key to the registry on Windows (HKLM\SOFTWARE\WOW6432Node\GOG.com\Games) with all the information required to identify the game, it's path and other information.

I have a working test version in my fork I am not putting it as a pull request because I'm not confident my code is suitable for merging but I have successfully tested it on several titles.

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[cbartondock]

If you submit a PR we can review it together. I would say it should be a setting in the Gog parser that appears on windows only, something like "use Registry instead of Galaxy DB"

[HazardousBackup]

@cbartondock I can look into it when I get the chance.