Use Monolog as PSR-11 compatible logger, refs #1686.

composer.json

composer.lock

lib/bootstrap.php

lib/classes/FilesSearch/FilesIndexManager.php

lib/classes/Log.php

lib/classes/admission/RandomAlgorithm.class.php

lib/classes/auth_plugins/StudipAuthCAS.class.php

lib/cronjobs/check_admission.class.php

lib/models/Course.class.php