This commit restructures noVNC, splitting it into the core directory
and the app directory, with the former containing core noVNC parts,
and the latter containing parts specific to the application.
- enable sending and receiving of raw array buffers in addition to
strings.
- add a read poll interval and set it to 15ms by default to detect
and handle quickly when a message is pending.
- also, detect a disconnected state and add call registration for
disconnect events.
唐飞雄 (twitter: @tangfx)