- Course format may define additional fields (format options) to store for course and each section
- Edit course form allows to edit format-specific options and refreshes their list on format change
- Course format may provide it's own form for editing a section
- Default form for editing section allows to edit all format-specific fields
- Class section_info refactored, it defines magic methods such as __get() to access basic section
information and format-specific options (retrieved only on the first request)
- format_base::update_course_format_options() allows to watch pre-update state of the course,
format_legacy automatically copies the options with the same names between formats
