Preferred name logging update (#19)

* Update preferred_name_logging.php

Some refactoring and needed adjustments to satisfy request from @bmcutler in PR Submitty/Submitty#4153

* Update preferred_name_logging.php

WIP

* Update preferred_name_logging.php

WIP

* Update preferred_name_logging.php

Better integration and improved error logging

* Update preferred_name_logging.php

WIP

* Update preferred_name_logging.php

WIP

* Update readme.md

WIP

* Update readme.md

WIP

* Update readme.md

WIP

* Update preferred_name_logging.php

WIP

* Update readme.md and preferred_name_logging.php

WIP

* Update preferred_name_logging.php

WIP

* Update

WIP

* Update preferred_name_logging.php

WIP (correct spacing of log output)

Author: pbailie