Finalizing the review mode

As you may have noticed, most of the recent updates were focused on improving the review mode.

In order to finalize it, I had to add the letters and numbers of the squares, the markers for the last move and the possible moves. These are colored in review mode (but not in game mode, as this would be considered cheating).

A green marker means that the square is guarded by another piece.

A red marker means that the square is being attacked by the opponent.

A yellow marker means that the square is challenged (guarded and attacked).

A white marker means that the square is neither attacked nor guarded.

I may change the white and yellow markers later, as the white marker is sometimes difficult to see. Thus, the marker for challenged squares would become orange and the white marker would become yellow.

Next I will need to fix the tactics, fix some minor issues and maybe add the status bar now and the cursor for the gamepad and then I will be able to move onto other parts of Caïssa Board. Those are less demanding so the finalization of the whole app is not very far now.