Changes

gaming-core: Player state and outcome are now kept in the Player object

Until now, a player's state and outcome were saved in the game state,
which was awkward and not very object-oriented. The state is now managed
by the player objects themselves. This required the Player interface to
become Stateful and to take a type parameter denoting the concrete type.
However, the State interface could be significantly reduced in size and
complexity.

gaming: project settings updated