Simple interface to be implemented to provide custom log consumers to the library.
An instance of the custom implemented class has to be passed to the library through the
Request for a Logger instance that will be used for logging occuring on the given
category. It is suggested, but not mandatory, that subsequent calls to this method
related to the same category return the same Logger instance.
category - the log category all messages passed to the given Logger instance will pertain to.
A Logger instance that will receive log lines related to the given category.