Replace std/selectors with poll

std/selectors uses OS-specific selector APIs, which sounds good in
theory (faster than poll!), but sucks for portability in practice.
Sure, you can fix portability bugs, but who knows how many there are
on untested platforms... poll is standard, so if it works on one
computer it should work on all other ones. (I hope.)

As a bonus, I rewrote the timeout API for poll, which incidentally
fixes setTimeout across forks. Also, SIGWINCH should now work on all
platforms (as we self-pipe instead of signalfd/kqueue magic).

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