FlatHub uses org.kicad.KiCad and everyone else uses org.kicad.kicad,
which leads to two entries in the Gnome Software search list for kicad.
To unify this into one entry, have each just provide the other app ID to
link them together.
Grr... appstream-util will error in strict mode for unknown tags and it
has no way of getting new tag information because there is no DTD
published. Just a flippin C-lang program that will "validate" your
file. So awesome that they are using XML! Definitely the best
representation when you are going to hard-code your requirements, not
version your data
This avoids conflict with existing kicad installations. Older version
files are preferentially opened by older KiCad installations while new
KiCad files get opened by version 6
The non-www https URL appears to redirect through a non-https URL before
reaching the www https URL, which triggers a warning in some appstream
validation tools. Instead, just go to the www https URL directly so
there are no redirects needed.
* 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
