Deliver wires on the sending loop, a step at a time (017, 2b-2)

A wire is now a sender of link/sending.h: its request goes on a
non-blocking socket as far as the socket takes it (connect, TLS
handshake, write, answer read), and its round waits for the socket or
its deadline (10 s with nothing moved). The answer is read as it comes:
the head whole, then a sized body counted down, a chunked one (few and
small) parsed again as it grows, or a body to the close. The crypto
table (version 6) takes the TLS handshake a step at a time, and reads
and writes say what they wait for. The owner pushes a wire once a turn,
as it does a link. A host whose app sends to ten links and ten wires
has 5 threads where it had 24 (none: 3).

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