Modified course format options reading and writing to be able to handle Editor elements by enabling them to split array values into
multiple values before inserting into database, and combining multiple values into an array when reading from the database.
Modified backup and restore code to use backup_nested_elements, and to interact directly with the database.
Co-authored-by: Jason den Dulk <jasondendulk@catalyst-au.net>
Co-authored-by: Matthew Hilton <matthewhilton@catalyst-au.net>
Jason den Dulk