Refactored jokers stack to be a list (AI used)

include/game.h

@@ -74,6 +74,10 @@ enum HandType
 void game_init();
 void game_update();
 
+// Forward declaration
+struct List; 
+typedef struct List List;
+
 // Utility functions for other files
 typedef struct CardObject CardObject; // forward declaration, actually declared in card.h
 typedef struct JokerObject JokerObject;
@@ -82,8 +86,7 @@ int             get_hand_top(void);
 int             hand_get_size(void);
 CardObject**    get_played_array(void);
 int             get_played_top(void);
-JokerObject**   get_jokers(void);
-int             get_jokers_top(void);
+List*           get_jokers(void);
 
 int get_num_discards_remaining(void);