tcp -> redismq multiplexer

Goals:

- port ircd.server.tcpserver[0] to C
- use redismq[1]
- use sev[2]
- libev
- BSD 2-clause license
- C99

[0] https://github.com/lessandro/ircd/blob/master/ircd/servers/tcpserver.py
[1] https://github.com/lessandro/redismq
[2] https://github.com/lessandro/sev