.l-game-container: disable user select.
card-view: small cleanup.
CSS: only show cursor for open cards.
Fixed an issue where :cards of columns could
become nil (and subsequently lists instead of
vectors) - have to make sure we return an empty
vector in discard-card and move-marked-card-to's
update-in methods.
helpers: renamed all-cards to all-column-cards.
setup: safer parameter name that doesn't clash
with the open? function.
helpers: move kings to empty columns. [fixes #8]