3323 - Add simple network primitives

Includes four Mu functions:
- $socket: Creates the C structure for a socket and tries to bind and
  listen on a user-provided port.
- $accept: Returns a number pointer to a new socket session. Should
    be called with the result of $socket.
- $read-from-socket: Read one character from the socket, passed in
    as a Mu number. Should only be called after calling $socket and
    $accept.
- $close-socket: Takes two parameters, one for the result of $socket
    and one for the result of $accept, closing both sockets
    and releasing bound ports.

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