Player handler package

This package defines a player data structure, collections of players,
and different interactions you can have with them:
- Extracting attributes (destructors)
- Checking if they're bankrupt or can bet
- Modifying a collection to adjust the balance of any one
  player (including errors in case that isn't possible)

cantedraw.asd

@@ -8,6 +8,7 @@
                (:module "src"
                 :components
                 ((:file "model")
+                 (:file "player")
                  (:file "game")
                  (:file "main"))))
   :build-operation "program-op"