expose deck metadata in cards+solution

• *version - code version number of Wagn software running this deck.
• *number of cards - number of cards in this deck. (maybe a non-magic card, constructed after we implement calculations)
• *number of card views (Number)
• *cards recently viewed
• *recently popular cards (the cards viewed in the last 1000 card views — ignoring inclusions?, ordered by most-viewed)
• (other statistical information?)
• *blocked email addresses
• ??

Also see expose card metadata in cards