Course modules can now implement the function mod_{module}_core_calendar_provide_event_action
which allows them to return an action to attach to an event.
Part of MDL-55611 epic.
Issues fixed:
* Additional rule validations.
* Rewrote recurrence logic.
* Additional unit tests, especially from the examples in the RFC.
* The date format "YmdThis" results into an incorrect date for the
"UNTIL" parameter. The literal "T" should be escaped, and a literal
"Z" is also needed at the end of the format string to indicate UTC.
* Implemented handling of negative modifier values for BYxxx rules.
* Implemented handling of BYWEEKNO, BYYEARDAY, BYSETPOS, BYHOUR,
BYMINUTE, BYSECOND rules.
This patch replaces all homegrown timezone
stuff with standard PHP date/time code.
The main change is the introduction of core_date
class that returns normalised user and server
timezones. From now on nobody should be using
$CFG->timezone or $user->timezone directly!
Other new features and fixes:
* admins are prompted for timezone during install
* editing of other users is finally fixed
* timezones are displayed in user profile
* new $this->setTimezone() in phpunit
* time locale is now automatically reset in phpunit
* timezone is now automatically reset in phpunit
* phpunit has Australia/Perth as default timezone
Renamed the userdate/usergetdate functions in the calendar type to be more
descriptive and made them abstract to ensure developers implement this
functionality in their calendar type.
Also tidied up PHPDocs for these functions.
