datepicker - TODO.md

1* Allow passing a specified start day for date selection instead of always using the current date
2* Implement `-m` to make Monday the start of a week
3* Make amount of columns for `-y` configurable
4* Improve cursor movement, differentiate:
5	1. Logical movement: prev/next day and prev/next week
6	2. Spatial movement: move cursor across month boundaries in view
7* Optionally allow specification of seconds in the time view
8* Differentiate `-y` and `-Y`, see https://man.archlinux.org/man/cal.1#OPTIONS