Goals for the sprint

Back-end

1. Keep track of active bombs
   • mapping turn -> bomb[ ]
2. keep track of current turn
3. bomb detonation function
   • enforce order of operations
4. refill board
   • in place, no gravity

Front-end

1. Keep track of row col
2. display magnitudes
3. display bomb
4. display explosion
5. display refill
6. improved buttons