[ktturvbp] Byoyomi with Fischer increment

At the end of a move in a game like chess, the time taken is rounded down to the nearest 30-second block, and that amount of time is subtracted from the time remaining.  Then an additional 30 second increment is added to the time remaining.

Attempting to gain both the Japanese timing advantage of not requiring high resolution time recording, and the ability to accumulate time in preparation for difficult ordeals foreseen.