use correct case for classes, closes #1233

lib/classes/ModulesNotification.class.php

lib/classes/SemBrowse.class.php

lib/classes/StudygroupModel.php

lib/classes/admission/CourseSet.class.php

lib/classes/admission/RandomAlgorithm.class.php

lib/classes/coursewizardsteps/LVGroupsWizardStep.php

lib/cronjobs/check_admission.class.php

lib/elearning/ELearningUtils.class.php

lib/elearning/Ilias4ConnectedLink.class.php

lib/functions.php

lib/models/AdmissionApplication.class.php

lib/models/Message.class.php

lib/models/MvvCourse.php

lib/models/User.class.php

lib/models/UserStudyCourse.class.php

public/show_bereich.php

tests/jsonapi/ConsultationsBookingCreateBySlotIndexTest.php

tests/jsonapi/ConsultationsBookingCreateTest.php