Calculates a time which should be allocated for the next move, based on move_number, total_time, inc_time (0 if not available)
and moves_to_go (0 if not available). Formula and chart used when moves_to_go is zeroed can be found in the /misc/time.xlsx Excel sheet,
but in general outline it tries to allocate more time during mid-game where usually there’s a lot of pieces on the board and it’s crucial
to find some advantage at this phase. Formula used when moves_to_go is greater than zero is simpler and allocates time evenly.