New game mode: moving cells

[LewisGaul]

Wacky idea for a new game mode: have the cells moving around. There are a few ways this could work:

• Rows constantly scrolling, e.g. odd rows to the left, even rows to the right
• Random movement of rows/columns

Some thoughts on how this might work:

• Game class initiates changes to the board and minefield together, e.g. every second on a timer. Note numbers on the board will change.
• Frontend receives a notification e.g. 'row 1 rotated to the left by 1', which it then animates by hiding numbers on the cells moving moving them and restoring updated numbers after the move is complete.
• Need carefully handling of clicks during transitions...