* Try bumping Coverity up now that we should be on a newer version
of it (so hopefully it supports GCC versions with 2 digits in their
number).
* Allow the metadata test to fail because of an upstream bug in the
appdata validation program that thinks the description tag isn't
translated even though it is.
* Switch to using org.kicad.kicad as the main app ID
* Move the appstream file to a metainfo file
* Rename all metadata files to use the reverse DNS scheme
* Add header matching to mime type files where possible
* Add a mime type for gerber job files
* Add a QA test that verifies all the linux metadata files and
run it in CI
* Update the visible names in the launcher entries to be more
consistent with the internal visible names
* Update various strings and items in the metainfo file so they
are more descriptive and easier to read
Ian McInerney