GitLab

The menubar role defined in the "menubar d-flex" element is not
required and it's causing the following error "Required ARIA children
role not present: group, menuitemradio, menuitem, menuitemcheckbox".

* Participant roles could not be updated to moderator and always defaults to viewer
* Remove additional DB query in form to retrieve the current module information

* Remove deprecated settings :
  - bigbluebuttonbn_recordings_validate_url,
  - bigbluebuttonbn_recordings_html_default,
  - bigbluebuttonbn_recordings_html_editable

It now reads "General" instead of "Site administration"

- Update/Add page headings
- Add notifications on override pages
- Rename buttons.

- Remove usage of lesson's tabs.php
- Add tertiary navigation into classic as the other modules do

All events_test, external_test and search_test classes:

- Namespaced with component[\level2-API]
- Moved to level2-API subdirectory when required.
- Fixed incorrect use statements with leading backslash.
- Changed code to point to global scope when needed.
- Fix some relative paths and comments here and there.
- All them passing individually.
- Complete runs passing too.

Special mention to lib/external/tests/external_test.php:
- external is not a valid component
- hence, its only valid namespace is "core"
- also, it's testing lib/external/externallib.php
- hence, the file (and class) have been renamed to external_externallib_test.php
  (to avoid conflicts with other external_test that may exist in core)