integrate trails, fixes #4102

app/controllers/admin/domain.php

app/controllers/admin/install.php

app/controllers/admin/lockrules.php

app/controllers/api/oauth2/applications.php

app/controllers/api/oauth2/authorize.php

app/controllers/api/oauth2/oauth2_controller.php

app/controllers/api/oauth2/token.php

app/controllers/contents/courseware.php

app/controllers/course/admission.php

app/controllers/course/block_appointments.php

app/controllers/course/cancel_dates.php

app/controllers/course/change_view.php

app/controllers/course/details.php

app/controllers/course/enrolment.php

app/controllers/course/forum/forum_controller.php

app/controllers/course/gradebook/lecturers.php

app/controllers/course/lvgselector.php

app/controllers/course/members.php

app/controllers/course/room_requests.php

app/controllers/course/scm.php