Include changed course settings in course_updated event

Currently the course_updated event includes the course fullname and short name and other data but it would be helpful it would include all settings changes as in the config log.

At the Open University and also at LSE, there have been cases where somebody changed a course setting and we wanted to know who it was, but we could only narrow it down to three or four people who edited something on that screen, rather than the one Guilty Party (for appropriate justice to be meted out).