This commit adds the missing logic for category events in
get_context() method. Without this fix, users will get errors
if they have category events with userid set to 0.

This reverts commit 9d58d4de, reversing
changes made to 535c0277.

We should be able to fetch the grade completion status for modules
that do not have custom completion configured. This also improves
unit testing coverage.

jun authored Mar 15, 2021 and Michael Hawkins committed Mar 23, 2021

* Fixed inverted $sameuser test data.
* Fixed caching expectation check. Caching only relies on whether the
user accessing the completion data is the same user or not.
* Fixed checking for the caching of other modules. Should have been
checking cm ID and not instance ID.
* Additional test case when whole course parameter is passed as
true, but the requesting user is different from the target user.

The given condition in the if statement did not take into account cases
when the setting is locked by hierarchy. Settings which are locked by
hierarchy should should keep their current values which were inherited
from the parent.

* Base class for fetching an activity module's important date for a user

Final deprecation for constant BADGE_BACKPACKURL (it has been removed)
and badges/backpack.js file (it has been removed too).
Besides, some methods have started the deprecation process too:
 - badges_check_backpack_accessibility
 - badges_setup_backpack_js()
 - badges_local_backpack_js()

Apart from that, string 'addbackpack' has been deprecated here
because it's not used anywhere.