Inara uses the [SLEF] format to export builds. This format is mostly
just a wrapper around the standard journal loadout format and includes
support for source app metadata and exporting of multiple loadouts at
one time. This change adds support for this format in the manual
importer. Eventually it would be good to support this in the import
route as well so Inara (or any other apps) can link directly to
coriolis.
[SLEF]: https://inara.cz/inara-impexp-slef/
