Weekdays, due dates, and checkboxes

Weekdays #

Support has been added to use weekdays when leveraging relative dates.

Weekday/business day/work day are synonymous in this context and can be used interchangably. These are all equivalent:

10 business days: ...
10 weekdays: ...
10 work days: ...

Thanks to @frantortosa for the suggestion!

Due Dates #

Another addition to relative dates, include by or before an event id to indicate that an event should come before the other specified event.

Thanks to @jgclark for the suggestion!

Task list items #

Support has been added for markdown style task list items:

- [x] some thing to do
- [ ] some other thing to do
- [x] third thing

This was another of @jgclark's suggestions!