Finishing 'socket'

[Raimo Niskanen]

Hello List!

I have committed changes for 'socket' to the master branch.
These were most of the "big" changes for the 24.0 release,
so feedback is now most welcome!

From the Release Notes to come:

    The experimental new socket API has been further developed. Some
    backwards incompatible changes with respect to OTP 23
    has been made.

    The control message format has been changed so a decoded value
    is now in the 'value' field instead of in the 'data' field.
    The 'data' field now always contains binary data.

    Some type names have been changed regarding message headers and
    control message headers.

    socket:bind/2 now returns plain ok instead of {ok, Port} which was
    only relevant for the inet and inet6 address families and often
    not interesting.  To find out which port was chosen port use
    socket:sockname/1, when needed.

There might be more changes I have missed to note.  If you find
any please let me know so I can add them to the Release Notes.

We have thoughts about more creative error returns, such as instead
of    {error, {invalid, {msg, Msg, addr}}}
maybe {error, [invalid, msg, addr, Addr]},
or    {error, {invalid, [msg, addr, Addr]}}.
Maps variants have also been suggested, but I can have not found
a nice format.

Best regards
-- 
/ Raimo Niskanen, Erlang/OTP, Ericsson AB