a module for wrangling decks of cards

Changes for 0.02 - 2024-01-01

• Add "move" method, like "deal" but in bulk.
• Add "pick" method to pick cards in some order from a deck.
• Pains are taken to preserve the array reference of the decks across the various methods so that the caller can hold onto them.
• Throw errors on various edge cases previously not caught.