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This should help prevent filling up UDP sockets when multiple
pseudotcp connections are over the same tunnel.

It seems to break with iOS peers in some cases.

Wake up GSources to add a new socket when needed.

If the component is gone, return an error to the APP to wake it up.

With 7 retries, it took almost a minute to timeout from 500ms,
so start at 200ms instead.

This is what RFC 5238 section 7.2.1

Instead of dispatching an error, just close all
the sockets.

If there were any sources that were notified by the last GMainContext,
first look through those, if they had nothign, then go for the others.

Instead of checking all sources, just get the answer from the main poll().

GClosures are not that cheap to setup

This was causing sources to all be kept until the pseudo tcp connection
grew too big. This could caused the sources to accumulate in the GMainContext.

This should reduce the overhead a bit.

Win32 has some special error code, so add function to convert those.

Ideally, this should be returned from each function call..

This way, retransmissions can happen