Wrote tests for the FacilityBookingMapper

Made slight changes all around to solve the a proble with the mapper abstraction
Wrote the functionality for booking a timeslot in a sports facility.

Has check for only 4 times per day.
Has check for only 1 time per timeslot per day.
Has check so you can't book a timeslot if it is only 1 hour or less til timeslot starts
Added methods in FacilityBookingMapper and interface
Added HotelUser, HotelUserMapper, HotelUserMapperInterface.
Added all needed methods to implemented what I added in controller and dbfacade.
Added a couple of tests for the new methods( will add more later)
Changed FacilityBooking so that it now also has a userID field.
Added Hotel_User to the sql script + sequence for it. Changed neccessary things to make it work with the current script.
Testing for the new functionality.

Wrote new constructors for testing in controller and dbfacade.
Wrote several tests for facilityBookingMapper
Gui stuff.

Added a menu/landing page/first gui.
Refactored names of guis to fit our naming standards.