The assets:meta command should clean up orphaned meta files #89
Description
If a user manually moves an asset but forgets to move the meta file with it, the new one will eventually get created which is fine, but the old one will just sit there forever.
In the command, after the meta files are generated, we could loop over all meta files and delete them if there's no corresponding asset.
Maybe the cleanup part could also be extracted to its own command.