Extract Game logic to a separate class

[VctorAHernndez]

Currently, the whole game logic is handled by the Table class (which is in the proj2.ui subpackage). We should extract all of the game logic into a separate Game class and register Table as a "listener" to all of the changes that might occur that can cause an update in the UI, like for example:

• When a player wins
• When the player's turn is over
• When a player lays cards on the table
• When a player discards a card
• When a player draws from the Deck
• When a player draws from the Stack
• When a player is selecting cards from his/her hand

[VctorAHernndez]

This commit (ef6c2e1) started some efforts that might benefit this issue.