Add "finish-day" activities.

problem

Shift start of the day is great setting, but i can set only static shift (eg 2h). I want to start new day when i start special activity, like Sleep.

why this useful?

Shift start day setting is good because i usually go to sleep after 00:00, and after day ends, goals&limits resets and running activity divides (one for yesterday, one for today). Often i go to sleep from 00:00 to 02:00, so because of i shifted start day to 2h, sleeping activity divides, and in activity list i see sleep 30min duration even if i slept 7 hours.

solve

Into activity setting you can add "finish day activity" boolean setting (after default duration).
Keep shift start day setting, it can be force new day start (if i forget to start finish-day activity)

This also will fix dividing sleep activity, because it will start in new day.