Auto-log lunch break

Currently, users need to manually log their lunch break, by clocking-out when their break starts and then clocking-in again after. This is a good default behavior, but its also a but tedious and can easily be forgotten.

We should add an optional feature which automatically logs a lunch break of a chosen length at a chosen time when clocking-out at the end of the day. This could be configured as part of the user settings/preferences.