Support advanced polling features in OS

Support interaction with epoll, kqueue, etc

I'm breaking this out from #3711 (moved) because it doesn't really belong in that ticket.

added component::core tor/torsocks parent::3711 priority::medium severity::normal status::new type::enhancement labels

Trac:
Reviewer: N/A to N/A
Sponsor: N/A to N/A
Severity: N/A to Normal
Status: new to assigned
Owner: ioerror to dgoulet

Releasing some old tickets.

Trac:
Owner: dgoulet to N/A

Change tickets that are assigned to nobody to "new".

Trac:
Status: assigned to new

moved to tpo/core/torsocks#8702