Support cheat mode

[nslewa]

• The sound and warning chits of a tile to be selected from relevant lists (that consider what has already been used) rather than randomly assigned. This selection must occur each time a character ends his turn in a tile whose counters have not yet been assigned. The GUI must distinguish between such counters and those that some player has already assigned.
• The roll of the dice to be fixed each time such a roll is required at any point in the game.