TODO:
* Check for sets
* Capture valid sets
* Shuffle deck
* Serve out 12 cards
* Deal out additional cards after set captured
* Reset game (click new game button)
* Track score (number of sets)
* Make button(s) look pretty
* Make buttons react to hover/click!
* Music!
* Background!
* Print "no set"/"too many cards" messages
* Add "quit game" button