Show time elapsed after the end of a break or work period until before the timer is started

[brianminsk]

Continue timer after a break or work period but count down from 0:00 (i.e. negative, e.g. -))) to show time elapsed since the end of a break/work period, before the timer is started again. (Hope that makes sense...) Probably makes sense to make this an option.

(I don't have time to implement any time soon, unfortunately.)