[x] Change UI at least to start offer and request resources at 0 to make selections more clear. Maybe could move in the direction of the current bank trade interface with colored blocks representing resources.
[x] All non-current players should have the option to decline or accept, and if all hit decline, the trade dict will reset and trade mode will end.
[x] Create a cancel button for the current player.
[x] Change "submit" button text to "Offer Trade"
[x] Make trade offer border the same color as the player who offered it to the non-current players.
[x] Currently cancelling a trade resets selection but keeps mode "trade" - is this intuitive?
Trading could be improved in a few ways: