Refactor: Moved verification methods to a new Verification class. Code was refactored to work with new class.

Feat: New method setTrackFromTrainNumber in TrainDepartureRegister.

Refactor: UserInterface changes to work with setTrackFromTrainNumber

Feat: New method addTrainDepartureFromInput in TrainDepartureRegister.
Refactor: UserInterface changes to work with addTrainDepartureFromInput.