a BT game: track states so can shutdown cleanly; transition from
master to slave; mechanism to defer work from callbacks to the main
loop. Can now quit and restart as guest against host on linux. Have
not tested between two Treos.
A full robot vs. robot game now works between two Treos. Added UI to
choose BT as transport mechanism, and added new send proc to establish
socket connection between host and guest. Works only for two devices:
no piconet yet. No error recovery, ability to quit game in middle,
start new game, etc.
