[DRAFT]: Tracker prototype

[mpasalic]

DO NOT MERGE

Convert Hanabi engine in this branch to act as a tracking tool only

Changes:

• Deck is simply an ordered 0..num_cards list (not the cards themselves)
• Cards are only assigned during player actions (to keep track of discards / board)
• Player moves now requiring inputing the exact card
• Hints now require indicating all slot indices
• Modified current formatter to display all players during each turn
• Added game log functionality (with undo) so mistakes are less catastrophic

TODO Simon's new formatter