Add an additional field for date of the event.
Set 'all day' event as a default option when you add a new event.
Change in the design of AllEventsWindow and EventDetailWindow according to UX redesign.
-Create application->switchManyWindowsBack() method
-Create equivalent to empty window enum class
-Remove stored prevWindows variables
-Add bottom bar to empty window (equivalent to allEvents)
-Repair going back to previous windows functionality
-Repair switching window (with empty events DB)
-Add EventShift value to event records time
