[FEATURE] Calendar - set working hours

[v-marinkov]

The time-blocking ability of the calendar is very welcome but I find myself irritated by the 00:00 - 24:00 timeline shown at all times. Hopefully no one works such hours, and it would be great to be able to set working hours in the settings such that only, say 07:00 - 19:00 is shown. This limits the amount of scrolling and confusing white space (empty hours).