Put all keys in consistent order and remove/fix bogus mime types, some
assigned to programs that don't even open files. Those files could use
some TLC from translators to provide translated names and tooltips, I
preserved some of the french that was already in the files.
This renames (well, actually regenerates from the originals) all the
icons installed on Linux to match the correct mime type names, and
adds all the missing icons in some sizes.
This file registers the file extensions used by kicad and their
corresponding mimetypes. Before this change the file was refering to
the old .brd extension and the wrong mime type. The file was also
renamed to kicad-kicad.xml to conform to the XDG spec which expects a
vendor-product pair as the package name.