Added manual booking for sports facilities.

Added button to booking frame in landingPage
Added manual booking frame, mostly a copy of logic from sportsfacilitybooking frame.
Added method in dbfacade and controller to get all userIDs
Added test for GetAllUserIDs
Merge branch 'manual_sports_facility_booking' of https://github.com/sallas/2nd_semester_project into manual_sports_facility_booking

Conflicts:
	src/dataSource/DBFacade.java
Imports fixed.