Chrome browsers sort the properties, but Firefox leaves them as defined.
Changed the code to put the elements in an simple array (json array) instead of
associative arrays (json objects) so that the elments are not reordered.
* forces the export for the categories, dishes and options, to be added as a
regular array of items, not as an associative array with the id as key
* added dockblock to help the IDE with the return elements for the exports
* make the dish options to be returned using the return value
* made the SQL query to fetch the options readable
* added the sort value to be stored in the Restaurant model
* added style to the CSS to make it clear what the sort field was used for
* added the sort value to be sent when storing the options
* added the sort field to the option form
