CTelegramConnection: Request id added to RPC Error output.
CTelegramDispatcher: Now we emit "messageReceived" only for unread messages.
CTelegramDispatcher: Added UserRequest to phoneNumberToInput{Peer,User}().

Note: Can be wrong.
CTelegramDispatcher: Now query "request telegram contact" on init.

In addition to UserSelf, now we query user with id "777000", which
seems to be Telegram SMS-sender.