Course fullname and Course shortname should be configurable in group_to_course mode

Currently the course shortname and course fullname just get the groupname and groupuid appended during creation with a ":" and without any additional spacing: https://gitlab.campusonline.community/community/moodle-enrol_campusonline/-/blob/main/classes/locallib.php?ref_type=heads#L159-163

There should be a space at least or ideally there should be an admin option to determine how the course name is build in this case.