Support for Windows

[ronchaine]

At least

• get windows-compatible event_queue

[ronchaine]

I guess this is a starting point

https://docs.microsoft.com/en-us/windows/win32/sync/using-event-objects
https://docs.microsoft.com/en-us/windows/win32/sync/waiting-for-multiple-objects

The internal logic should be about the same as in linux version that uses epoll, so this
should be somewhat simple.