For legacy reasons, the course renderings uses a format setting to know
if the page is multiple sections per page or a single section per page.
This format specific dependency is not solved using a get_course_display
format method any plugin can extend.

Ferran Recio Calderó authored Jun 21, 2021 and Amaia committed Aug 20, 2021

The course index is the first UI component that implements the new
drawers and the reactive components. The course index uses the course
state to present the current course structure and changes whenever
that structure change.

When using section drag and drop, the topics and weeks formats expected
the '.section_add_menus' element to be present so it could update it on
section drop. Due to MDL-68056, this control is only sometimes present.
This has been updated to conditionally swap to address this.

These functions were used only by deleted upgrade steps
so it's safe to proceed with straight deletion, considering
them internal. Deletion has been documented in corresponding
upgrade.txt files:

    - format_topics_upgrade_remove_numsections()
    - format_topics_upgrade_hide_extra_sections()
    - format_topics_upgrade_add_empty_sections()
    - format_weeks_upgrade_remove_numsections()
    - format_weeks_upgrade_hide_extra_sections()
    - format_weeks_upgrade_add_empty_sections()

New function to return the course format settings for external clients
via Web Services.
Some settings (like private keys/tokens) should be not returned if the
user hasn’t appropriate permissions.

Add field 'visibleoncoursepage' to the course_modules table
Add site-wide setting for turning on stealth mode availability
Add callback for "stealth" mode support in the course formats
Change display of modules/sections availability on the course page

- New site setting to define the default course duration (used to set
  the default end date for some course formats)
- End date setting out of restore
- Fix tool_uploadcourse
- Other fixes here and there

This patch makes the default section name appear in brackets
beside the 'Use default section name' checkbox.

Creates a new method of handling all the section related icons.
Including a new method that places these actions in a menu for topic and
weeks course formats. (This version replaces "Edit" with "Topic/Week/or
Section menu")

A confirm dialog is given when Javascript is off but not when it is on.
This aligns the two so that they neither have a confirm when duplicating
an activity.

Also:
 * fixed zindex issue + spinner placement
 * added notes to course format and theme upgrade texts
 * fixed behat tests after action menu changes

- added function format_base::is_section_current()
- overwritten in format_weeks::is_section_current()
- deprecated function format_section_renderer_base::is_section_current()

This reverts commit 45f93db9.
This reverts commit 3f798d4a.

- added class format_base as the base for all course formats
- added class format_site for the pseudo-format 'site' used for displaying activities on the front page
- added class format_legacy that overrides format_base functions with calling old-style 'callback_xxx' functions
- replaced all usage of 'callback_xxx' functions with format_base methods
- made arguments of get_section_name(), get_course_url() more flexible
- deprecated function get_generic_section_name(), it's contents is moved to format_base
- global_navigation::format_display_course_content() is removed, plugins can supress the sections navigations using extend_course_navigation()