Time tracking feature

[srid]

Requires adding drawer parsing to org-mode library

https://orgmode.org/manual/Clocking-Work-Time.html

[srid]

This feature should definitely display a real-time clock of an ongoing timer.

It can be displayed in the body, as well as the title (so it appears on the inactive tab text).

Should be straightfoward to implement on top of Ema's model LVar (see its clock example).