using atomic transactions.
If a card happens to not be owned by the trading user, the entire
trade is being rolled back.
Rollback behaviour is a bit weird though, since we have to rollback
manually even in a managed transaction.
- Trade finishing states are now handled properly.
- Deferring cancel button press
- A user is on a 2 minute cooldown after a trade finishes or
cancels if he is the one who initiated it.
- Updated emote IDs
