once UDP sockets and/or per-device (not per-game) connections come
along. Lots of changes, most not involving code flow but a couple
that did. So far two gtk games can connect and exchange moves.
Haven't tested reconnection or store-and-forward.
duplicating set of sockets owned by a cref, moving it from cinfo into
cref and caching a copy outside when cref is unclaimed (after which no
change is possible until it's claimed again.)
