This reverts commit 5162369a84. Keep "de.hohnstaedt.xca.metainfo.xml", because it is not flatpak specific, but specified by freedesktop: https://www.freedesktop.org/software/appstream/docs/sect-Metadata-Application.html All this flatpak stuff does not belong here, but into https://github.com/chris2511/flathub.git
5162369a84