Add warning dialog when changes in an employee profile are unsaved.
Move schedule preset buttons from side of selector to side of each option in select menu.
optimize behavior of selector: will now switch to empty when deleting currently assigned preset, and will assign automatically any new or copied preset to current employee.
Also fixed issue with with backend not treating first_work_day properly when creating new employee. Also did some optimizing for the employee list table with consistent sorting and better list mode.
minor bug fix with schedule preview not showing up in the schedule tab when looking at the details of an employee who has a schedule preset assigned to them.
