Implemented a workaround to pass UTF-8 strings through qDebug(): As the argument...

Implemented a workaround to pass UTF-8 strings through qDebug(): As the argument of qDebug() is defined as char*, we cannot pass UTF-16 strings. And as qDebug() mangles UTF-8 strings, we cannot pass UTF-8 encoded strings directly either. Consequently we will now encode UTF-8 strings as Base64 before passing them to qDebug(). A special prefix ("@BASE64@") is used to indicate Base64 encoded strings.