* Added registrationCode url param to the registration page to autofill the code
* Added a link column to the admin registration code table for easy copying of registration links
* Added a simple database schema that is created at start
* Added database methods to CRUD registration codes and read registered users
* Added a table to the admin page with registration codes
* Added a form to create registration codes
* Added embedded forms to expire and delete registration codes
* Added endpoints to facilitate expiring and deleting registration codes
* Added models and helpers to facilitate storing and retrieving data
* Added a password safety validator on registration