This is intended to visually separate hidden course from open
courses in the course overview block
by applying a "Hidden from students" tag to the various views in
this block.
To achive this, the course summary exporter's output must be
augmented with a "visiblity" attribute,
carrying the given course's corresponding visibility setting.
Since the exporter now expects this data point as part of its input,
the output of the course_get_recent_courses()
function had to also be augmented with the course visibility setting
to provide this value.
* all dashboard card templates moved to /course/templates/
* added aria labels for course short name
* removed ":" from other course aria strings to improve screenreader output
* add new preferences for hidden courses
* Modified course filter to use the user preference
* Behat test
* Regex update
* Toggle hide/show
* Update enrolled_course getter to pass hidden value
* provider
* unit tests
