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Provide an AppData metadata file

In order to be published by flatpak-friendly software distributions, I
have to provide this kind of metadata.  I have chosen to give it as an
XSLT stylesheet to apply on a list of releases, because it may change
independently of the source code (as the releases are purely git
tags).

I have also provided a mechanism to extract releases from the git tags
automatically.  The release messages are simply the git tags,
converted from org-mode to HTML.  This is interesting because the
appstream metadata supports HTML to a certain extent.

Finally, I have set up a strict validation with appstream-util.
Unfortunately, the CI/CD pipeline runs on the old debian, so the
launcher tag is not supported.