[CHANGES]
- Allow Notifier subclasses to last-ditch handle unrecognised
->configure() params
- Added $notifier->adopt_future
- Added $notifier->invoke_error and 'on_error' event
- Ensure that TimeQueue inserts in FIFO order for equal timestamps
- Kill remaining docs to long-dead IO::Async::Sequencer
[BUGFIXES]
- Cygwin needs the SELECT_CONNECT_EVEC OS hint as well
- Probe for a broken port to perform listen() tests on by using
ReuseAddr => 1 so it matches what IO::Async will do (RT84051)