Implement the bayesian AI approach

[SebastianVeuskens]

• Try to compute a comprehensive calculation of all possible positions of the ships, according to the given position
• Choose the most probable field out of all fields, e.g. the field with the highest number of ships, summed over all possible positions
• N2H: Think over more sophisticated methods to choose the field instead of the highest number (like probable fastest way to end the game or fastest way to sink a ship, might differ from approach before)