Added new UI config option: "can-close", default set to true, if set to false, plugin will auto reopen the flip UI to avoid player close the flip UI by self.
Added new config.yml option: "reward.give-item", default to WAIT, if set to INSTANT (a new method), we will instantly give player the card reward when he is flipping the card. This will lose some animation effects, but it will reduce the likelihood of players losing rewards.