Fix panic in Yamux state machine when a remote closes a substream with an active timeout #1122
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Fix #1119
This fixes the logic of the Yamux state machine. Previously a substream was dead when its reading and writing side are closed. Now it also requires the substream to not register itself for later wake up.
Due to this change, I've also reviewed the usages of
wake_up_afterand restricted them to when we actually want to wake up later, as right now it is used quite liberally.