only getType() left is Queue::sortAll() and StudentPage::editApp()
Merge https://github.com/COMP2404/RepoYourCar
Merge branch 'master' of https://github.com/COMP2404/RepoYourCar
Merge https://github.com/COMP2404/RepoYourCar
Merge https://github.com/COMP2404/RepoYourCar
added Queue::getAppsByFirst() and Queue::getAppsByLast()