MDL-46639 mod_scorm: Fix load of simple AICC content

Thanks to Ian Wild for the report and suggested patch.
MDL-46776 gradereport_grader: Improve Grader report user interface

* Adding assignments to test course generator to more easily test the grader report with large number of students and graded activities.
Merge branch 'MDL-46895' of git://github.com/colchambers/moodle
Merge branch 'MDL46887_assignment_file_max_size' of git://github.com/Dave-B/moodle
Merge branch 'wip_MDL-43918_m28_cm' of https://github.com/skodak/moodle
Merge branch 'MDL-46923_master' of git://github.com/markn86/moodle
Merge branch 'MDL-46916' of git://github.com/timhunt/moodle
Merge branch 'MDL-46894' of git://github.com/timhunt/moodle
Merge branch 'MDL-46917-master' of git://github.com/andrewnicols/moodle
Merge branch 'm28_MDL-46900' of https://github.com/totara/moodle
Merge branch 'wip-MDL-46874-master' of git://github.com/marinaglancy/moodle
Merge branch 'master_MDL-46816' of https://github.com/danmarsden/moodle
Merge branch 'MDL-46867' of git://github.com/timhunt/moodle
Merge branch 'MDL-46868' of git://github.com/timhunt/moodle
Merge branch 'master_MDL-46842' of https://github.com/greg-or/moodle-mod_assign
Merge branch 'MDL-46753-master' of git://github.com/lameze/moodle
Merge branch 'm28_MDL-46716' of https://github.com/totara/moodle

Conflicts:
	theme/bootstrapbase/style/moodle.css
Merge branch 'MDL-46477' of https://github.com/shashirepo/moodle
MDL-46875 tinymce: Fixed issue with full screen and spelling
MDL-46842 assign: Fix for unit tests - previous patch was completely ignoring manually reopening attempts.