ExchangePhase
 - Add a cpu processing state.
StateManager
 - Add a signal for signalling the ai to perform an action.
GameManager
 - Add function for updating the AI's knowledge base.
CardArray
 - tweak for removal of an enum item.
Card
 - Remove unneeded enum item and redefine the values in Value enum.
AI
 - Update code with stubs for determining what cards to discard.