Installer fixes and enhancements. #20776
Merged
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GoG and Steam installations may have DLCs. This results in optional files. We already have the IDFiles entry to verify a specific file exists, but currently both implementations will ignore the IDFiles entry completely. This PR fixes that. This not only fixes DLC files, but also ensures the installer no longer crashes when you delete the game folder, but keep the app manifest file (steam) or the registry (gog) intact.
We already have a bunch of extractors but we were missing the most basic one: zip files! I also added that. (Used for OpenE2140, as the GoG version ships the soundtrack as .zip)