Require the user of telegram to provide a callback to create and cleanup proxy connections, to allow
the application to create new connections when needed.
When the current phone number is not registered with the telegram network, ask for first and last name and proceed with the regular sms-code authentication scheme.
Use purple debugging functions by formatting the string beforehand and then passing the readily formatted string, instead of doing it with va_list. Log into the telegram network using the provided SMS code and hash or request a new one, in case one of those isn't provided. Store and load the state using the file config/auth, to be able to restore previous logins.
Remove the misuse of va_list and emulate behavior of purple debugging functions in our own code, since a va_list cannot be passed to purple_debug_info,
