Support advanced polling features in OS

Support interaction with epoll, kqueue, etc

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

added component::core tor/torsocks in Legacy / Trac parent::3711 in Legacy / Trac priority::medium in Legacy / Trac severity::normal in Legacy / Trac status::new in Legacy / Trac type::enhancement in Legacy / Trac 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 from legacy/trac#8702 (moved)

added Feature label and removed 1 deleted label

removed 1 deleted label

added Icebox label