Next step in converting util_ methods that required blocking: blank tile
assignment. Now post a query and add a method that the client code can
call when the user's decided. Include enough state (col, row, and
playerNum) so that it's probably pretty safe.
Probably breaks curses build, but for gtk and Android
turn move and trade confirmation into a two-step process, making
board_commitTurn() non-interactive when called with a second
parameter. The old blocking util methods now return void and it's up to
the client code to interact (on the main thread) then re-call
board_commitTurn() if appropriate.
First attempt to stop blocking the jni thread: instead of returning a
password from a util_ method, have it include enough state that the UI
can return, put up a dialog, and then pass that state and the password
back and have them matched up again. I think this will work for the
remaining blocking Alerts too.
