* Make the constructor private as it should only be instancied through
static methods
* Do not duplicate the code between get_from_instanceid,
get_from_cmid and get_all_instances_in_course
* Provide a way for external participants to be invited to a meeting by giving them an url/password
for external users (not registered in Moodle)
* Add guest access page with username and password prompt
* Add form and modify API calls to take into account guest login
* Add a form modal to add guest users emails
* Allow copy of link and password in both popup form and module form
* The guest should be approved by default. It should be intentional to let them
in without checks.
* Guest access URL and password should not be copied when duplicating or backing
up the activity.
* The mod_bigbluebuttonbn_meeting_info web service function now
returns guestjoinurl and guestpassword only for moderators.
* Redirect if user already logged in
Note: this will allow guest to connect to an existing and running meeting. The moderator will then
be able to adjust the guest user's right. For security reasons we do not yet allow moderators
to join the meeting directly (or start a meeting)
* Opening braces should be on the same line
* Unwanted MOODLE_INTERNAL
* Behat edit_instance.feature should use "activity editing" page locator
* Coverage indication
Paul Holden