When a payload is a .zip file, use MarbleZipReader to extract it.
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Added in https://github.com/KDE/marble/commit/00bf0e599c1fb080bdac9bbd3024a011842594ed
Next thing missing is to change (copy and rename) the maps.xml backend and replace the .tar.gz ones with .zip. Also verify that for each map theme we have a .zip variant as well.