MDL-43639: Prevent user updated event on every login

If auth plugin prevents local passwords, then user
is updated and event is triggered on every login.
MDL-46619 mod/forum author showing in Q and A forum
MDL-46639 mod_scorm: Fix load of simple AICC content

Thanks to Ian Wild for the report and suggested patch.
MDL-39233 mod_url: fix php notice
MDL-39233 mod_url: added unittest for get_course_content
MDL-46911 Database activity: jump to correct place in list after (un)approve
MDL-46451 mod_lti: Fix restoring old float grades

LTI's activity table used to have a float
field for the grade.  Now it is an integer
so we must restore the grade as an integer
so it matches the table schema.
MDL-46961 SCORM: JavaScript Hoisting issue.
MDL-30414 block_private_files: convert button to inline link
MDL-46539 assign calendar: Fix lastcron value for assign cron
MDL-46633 chat: Chat send button gets stuck
MDL-45952 feedback: non-respondents in groupings

Fixes feedback non-respondents list to show only members in groups in
the selected grouping if "Available for group members only" is selected.
MDL-46979 backup: remove duplicate string.

Thanks to Matt Sammarco for spotting this.
MDL-45909 install/css: Left align input form fields on Install pages, in RTL mode
MDL-46861 added missing required field areaname
MDL-37312 backup: Keep course idnumber on same site course restore

When the course idnumber is set during a same site course restore,
retain the course idnumber if there are no duplicates.
Automatically generated installer lang files
MDL-46902 core_course: display meaningful message when no courses found
MDL-46902 core_theme: described changes in theme/upgrade.txt
MDL-45818 core_message: use system context if user no longer exists