Dissociate us a bit from poll(2) so that we may even run on top of something else, and also allows to provide specific values for signal (EV_SIGNAL) and timers (EV_TIMEOUT).

from syncparty and amused; locally tweaked to support an arbitrary number of timers.

Correct export usage; rename variable in cmd_mappings, allow to filter by identity name.

red/green is not a great choice for diff colours: it's a bad combo for (some) colour-blind people, and they may also carry an implicit meaning of 'good' and 'bad', or 'ok' and 'not ok'. Instead, just like tog and gotwebd, use a combo of purple and cyan, which was choosen by a colour-blind user (I'm told).

This is intended to generate and manage certificates outside of telescope. Some operations are already available in the telescope UI, such as use and forget a certificate for a specific page, but generate and removal are hard at the moment to implement inside telescope limited UI, so provide an helper program for that.