Rename appdata to metainfo and install into metainfo directory
Appstream nowadays prefers .metainfo.xml
:
https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html#spec-component-location
Signed-off-by: David Heidelberg david@ixit.cz
/cc @guido.gunther This is the same patch as in !337 (closed), with ci fixed, and keeping @okias as author