Builder fix
Logger
Refactored xml parser
External interface started
External interface
External interface: notifyConfigLoaded
External interface: notifyError
External interface: notifyCloseConnection, notifyRegistered, notifyBalance, notify
External interface: notifyCallbackHold, notifyCost, notifyVideoFormat, notifyOpenVideoView
Messenger and external interface
External interface: notifyAddCall, notifyRemoveCall, notifySubscription, addLogMessage, notifyVersion, notifyXcapResponse
External interface: notifyRegisterRequired