Archival preparation

[enumag]

• Install and revalidate all chapters using higurashi:missing script
• Include all UI assets variants in the archive
• Include all video variants in the archive
• Add readme with a guide how to select UI assets and video version
• Adjust installer to work with the archives

[ItaloKnox]

• Migrate wikis to Github
• Bump MG/GOG engines to the same version as Steam

Gonna add more as I think about them.

[drojf]

Just a note that the installer should be able to support downloading from torrents (since it uses aria2 for downloading).

• Optional: Close all "important" issues here: https://github.com/orgs/07th-mod/projects/2 . Some of them are mostly completed already so it would be worth finishing them off (mostly my stuff). I guess anything that doesn't go in the archives (like the Higurashi DLL) can be done any time, even after we've finalized the main archives.
• Backup developer files somewhere, especially if they're hard to get/recreate. Any files linked on the developer wiki should be publicly available in case translators need them. Other files do not need to be publicly available. I can keep these on my Onedrive indefinitely probably as one backup point.