The component the audience belongs to is used by the cards exporter
for rendering the editing interface. Avoid duplication in determining
this value by defining appropriate method in the base class.
Create the base audience class, to be extended by all audience types
across the site. Implement types allowing audiences to be created per
user, cohort or system role assignment.
The helper class is used for interrogating report audience instances
and retrieving access lists of those users able to view specific
reports.
Co-authored-by: Paul Holden <paulh@moodle.com>