Replace Malloc With Pools

This commit introduces an object pool and replaces instances of malloc with pools where sensible.

source/game.c

@@ -586,7 +586,7 @@ void sort_cards()
         if (hand[i] != NULL)
         {
             // card_object_get_sprite() will not work here since we need the address
-            sprite_destroy(&(hand[i]->sprite_object->sprite));
+            sprite_destroy(&hand[i]->sprite_object->sprite);
         }
     }