New mode: 2v2
Fetch initial game params when joining game.
Game params refactoring
Make change of observing & observers not interruptible.
Move TreatAs prior to Skill/VirtualCard
Fetch ready state from server
Prompt ban/select on when choosing girl.
Reduce UIActionConfirmButton's min_width.
Fix crash caused by BalloonPrompt refactoring
2v2 mode logo
incr ver, welcome msg.