Bug fixes

Overdue RC1.

- Defined updated as a date.
- Fixed typo in course_report_access().
- Fixed {course_report}.updated not being updated.
- Added enrollment update date.

Fixed a pretty big performance issue when working with really large quizzes or loading lots of questions at once.

#2895442: Long load times on quiz pages

• Issue #3033781 by stefan.korn: Fixed vartheme subtheme does not use the toolbar top space issue as it was fixed: from base theme

• Convert first letter lookup logic to use utf8.
• Use config supplied Group prefixes instead of hardcoded ones.
• Temporary fix for incorrect ALL Count.
• Update processor instructions.
• Add facets dependency checks
• Make Group names configurable.
• Make helper class into a service.
• Add a dependency check for all processors.
• Better documentation for methods.
• Code cleanup.

• Convert first letter lookup logic to use utf8.
• Use config supplied Group prefixes instead of hardcoded ones.
• Temporary fix for incorrect ALL Count.
• Update processor instructions.
• Add facets dependency checks
• Make Group names configurable.
• Make helper class into a service.
• Add a dependency check for all processors.
• Better documentation for methods.
• Code cleanup.