Break out the server process management to a new FactorioServer class in
lib/factorio. This class takes responsibility for managing a factorio
server, communicating with it and handling the stopping of it. It also
replaces the previous effort to do this in lib/factorioServer.
This change also updates the version of rcon-client, and since the
author of it has updated it to use UTF-8 the fork is no longer
necessary. It also removes the messageInterface implementation
in favor of just calling the rcon-client library directly since
this has rate limiting logic built in.
The lib/factorio library is intended to abstract all the interfacing
that happens with Factorio.
