MDL-44670 themes: Updated screenshots of Clean and More
MDL-44590 category: correct get_string component
MDL-44590 behat: Add test for course category idnumber duplication
MDL-34353 Javascript: Allow chooser dialogues to fall back to non-JS version

In order for a chooser dialogue to be able to fall back to it's non-JS
equivalent, we need to use a different set of styles.

This change makes the chooser dialogue preparation function add a new class
to the body which is utilised in the CSS to accomplish this. When the class
is not present, the dialogue content is displayed inline.
MDL-44739 theme_more: Set default theme settings
MDL-44745 Assign: Make the grading table use the fullname function from the assign class.

This will take blind marking into account when displaying student names.
MDL-44745 Assign: Fix typo in assign->fullname function

This is a new function on master only.
MDL-32729 Question: Switch to the YUI3 chooser dialogue

This uses the core chooserdialogue and associated style changes to make an
easily generated chooser with question descriptions.
MDL-32729 Question: Convert remaining Questionbank code to YUI3
MDL-44701 gradereport_grader: Display warning on navigation if unsaved grades are present
MDL-43284 Theme: Clean theme errors with padding in Question Bank fixed
MDL-44762 editor_atto: Closing dropdowns when item is clicked
MDL-44834 editor_atto: Delegate change event to one editor
MDL-44837 Behat: 'dialogue' selector only works for confirm dialogues

The dialogue selector in Behat (used only in one place) didn't work for
other types of standard Moodle notification dialogue.
MDL-35305 wiki: backup and restore files

Thanks to Tatsuya Shirai for the patch
MDL-44715 use parent::validate_data() consistently in all events

Includes some minor PHPDocs typo fixes.
MDL-44754 Atto: Explaining what group names are used for in toolbars
MDL-44811 quiz settings form title: change for consistency.

Thanks to Fred for poining out that most other activities use the work
Appearance for these sorts of settings.
MDL-40910 add new core event user_graded

This event is triggered when teacher manually edits the grade in gradebook.
MDL-44746 core_events: removed incorrect uses of snapshots