MDL-44575: Prevent cron from sending feedback notifications when assignments are hidden in the gradebook
MDL-45239 editor_atto: The editor cannot be active if it is not the active element

FireFox thinks that you can have an active selection on an element which
currently does not have focus. How this can be the case is a mystery.
MDL-45254 atto_equation: Allow insertion of macros at the beginning of words
MDL-44398 tags: Fix incorrect usage of caps
MDL-45257 mod_assign: Removing wonky feedback_updated event
MDL-45258 tags:context object/0 should not be passed to tag_set()
MDL-42956 auth: Fix hard-coded LIMIT clause on keepalive_client method.
MDL-45298 theme: More permissive usage of retired themes settings
MDL-45292 filepicker: fixed border style

Fixed base style issues on RTL.
MDL-45315 block_news_items: Add missing depedency
MDL-27459 Completion: When ratings off, disallow grade completion

For activities that use ratings, there is no grade unless ratings
are enabled. The completion system still lets you select 'complete
when user gets a grade', which leads to later errors.

This change simply disables the 'completion on grade' field if
ratings are enabled for the activity, but not turned on in the form.
MDL-45256 portfolio: Unit tests for rewrite pluginfile urls
MDL-45256 portfolio: Do not require strict XML when parsing content
MDL-45273 quiz: move admin settings into classes folder.
MDL-45273 remove the need for quiz settings.php to include locallib.php.
MDL-45273 only create the quiz settings if necessary.
MDL-45321 quiz upgrade: make it more tolerant to old bad data.
MDL-45273 quiz: Fix codechecker issues.
MDL-44780 filter_mathjaxloader: switched mathjax filter on by default
MDL-44780 filter_mathjaxloader: mathjax is now at the top of the filter list