I've long wanted common code and state that outlast a single game. The
smsproto stuff is a step in that direction, but this file will be a
place for anything new. Starting, perhaps, with a mapping of deviceID ->
addressInfo (e.g. BT name or SMS number of opponent device) that will
let me stop duplicating that stuff in every game's comms state. We'll
see. It's guarded by a compile-time flag so I can play with in on the
Linux version until ready.
Handles case where the app receives only a subset of the SMS messages
into which a larger game-level message has been broken. Now when it
restarts and the remaining parts come in the whole can be reassembled.
Trying to separate what's game-specific from what can be app/device
specific (i.e. with a long lifespan, and available when a game isn't
open.)
Android will be broken after this commit and fixed after the next
