Switched All Methods Being Called From filestore.php

Made all methods private in filestore and created two public methods to call those private methods.

public/address_book/address_book.php
Replaced All Methods Being Called From filestore.php

Made all methods private in filestore and created two public methods to call those private methods. Those 2 methods are now being called in todo_list.php

public/todo_list/todo_list.php
Changed All Public Methods To Private

Created two public methods to call those private methods. Those 2 methods are now being called in todo_list.php & address_book.php

inc/filestore.php