networking support.
Second, I moves keys.c from qw and nq to libs/video/targets when I did
the next thing.
Existing user configs which do binds, sledge hammer. Sledge hammer,
existing user configs which do binds. *WHACK* *WHACK* *WHACK*
See, much nicer now.
Someone should document it, and fix all targets which don't use SDL for
input. (I honestly don't expect svgalib and the like to ever be fixed.)
