MDL-39695 theme_formal_white: added a colour hover for coursebox following trendcolour setting
MDL-40260 block_course_overview: prevent MNET courses from being dimmed
MDL-39770 mod_chat: some tweaks to make it prettier to reduce screen wastage
MDL-39770 mod_chat: cleanup of the Bubble chat theme
MDL-40670 Theme: Rescale headings overriding bootstrap defaults
MDL-40680 store_memcached: fix serialiser options

* Use correct lang string for SERIALIZER_IGBINARY
* Use PARAM_INT for the parameter
MDL-40666 cohort: remove duplicated code from tests
MDL-40666 enrol|cohort: PARAM_NUMBER -> PARAM_INT

PARAM_NUMBER is a float, our id's are int's

* Fix core_cohort_get_cohorts to specify correct return type on cohort id
* Fix core_enrol_get_enrolled_users_with_capability to specify correct
  correct return type on user id
* Fix core_cohort_update_cohorts to specify the right parameter type
  (int) on cohort id
* Add tests to verify the bug on core_cohort_update_cohorts param type.
MDL-40702 SCORM: - use iframe instead of object - iframe is supported better.
MDL-37333 theme: Fix 'Clear theme caches' redirect.
MDL-38837 badges: Check for http or https in badges backpack support
MDL-39441 behat: Restrict config.php allowed settings
MDL-39441 behat: New setting to expand the list of allowed settings
MDL-40626 gradebook: Prevent incorrect override with multiline feedback

The quick grading option doesn't allow mutliline editing.
MDL-39846 implement new event dispatching and base event class
MDL-39846 sample conversion of role assignment events
MDL-39846 convert enrol_category to new events and class loader
MDL-39846 more fixing and cleanup of new events

* fix typos (thanks Rajesh)
* move log related data out from event API specification
* change callable key in definition to callback
* use event data in observers instead of cached records if possible
* event level is now a number 1…100
* improved event safety checks
* add event name and description method
* new can_view() method
* improve unit tests to test all callable types
* improved performance
MDL-39846 protect event dispatching process
MDL-39846 add logging TODOs