MDL-36707 Course: set conditionalhidden class properly, so it doesn't overlap with dimmed class
MDL-36305 theme: Forum reply button is not removed using MyMobile
Merge branch 'wip-MDL-36453-MOODLE_23_STABLE' of git://github.com/abgreeve/moodle into MOODLE_23_STABLE
Merge branch 'MDL-36548_23' of git://github.com/pauln/moodle into MOODLE_23_STABLE
MDL-30731 calendar: Fixed display of images in event descriptions
Merge branch 'MDL-36571_23' of git://github.com/timhunt/moodle into MOODLE_23_STABLE
Merge branch 'MDL-36646_23' of git://github.com/timhunt/moodle into MOODLE_23_STABLE
Merge branch 'MDL-30731-23' of git://github.com/FMCorz/moodle into MOODLE_23_STABLE
Merge branch 'MDL-36022-MOODLE_23_STABLE' of git://git.luns.net.uk/moodle into MOODLE_23_STABLE
Merge branch 'MDL-33863_23' of git://github.com/timhunt/moodle into MOODLE_23_STABLE
Merge branch 'wip-mdl-36707-m23' of git://github.com/rajeshtaneja/moodle into MOODLE_23_STABLE
MDL-25552 mod_lesson: changing filepicker element to filemanager to allow the deletion of a file
MDL-30884 quiz: ARIA attribute for the coutdown timer.
MDL-36170 - mod/data - Don't display the blocks editing button within table HTML, use a standard API to create it.
Merge branch 'MDL-25552_m23' of git://github.com/markn86/moodle into MOODLE_23_STABLE
MDL-36167: Update all users in assignment quickgrade form to ensure feedback is saved
MDL-36167: Assignment quickgrading fix when there is no grade (ensure feedback still saves)

This patch modifies the previous on by Luke Tucker so that the lastmodified hidden field
is always added to the quickgrading form even if there is no grade for the assignment. This
ensures that the lastmodified checks still work (to prevent teachers overwriting each
others feedback) and feedback is saved when there is no grade.

Conflicts:

	mod/assign/locallib.php
MDL-36551 - mod_data: Onsite presets now retain the advanced search template.

Presets that were saved to the site would lose the advanced search template when being used.
The previous check was put in place to see if the advanced search template existed or not (presets pre 1.9),
This checked external files properly but not onsite files.

Now checks are being done on both internal and external preset files.
MDL-36184: Assignment quickgrading should only update lastmodified dates for modified submissions
MDL-36549 Lesson module: fixed strict standards errors