MDL-40059 glossary: event course_module_instance_list_viewed
MDL-40059 glossary: events for add/delete/update entries
MDL-40059 glossary: events for add/edit/delete glossary category
MDL-40059 glossary: events for entry approval/disapproval
MDL-40059 glossary: event for entry viewed
MDL-40059 glossary: unittests for events