postEmptyEvent; pass transport type with incoming packets so they can
be rejected if not on expected channel (to stop IR, which is always
on, from injecting into a BT game); do BT work and fire timers even
when menu is down; don't let robot run until after board is drawn for
the first time; on startup, don't let robot run until after board is
drawn once. Up version to b3.
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.
