Make DisplayName field in User database

[QuinnBast]

When a user creates an account, they will login with their username. However, it is likely that some people will use profanity or other vulgar names. The user database should have a DisplayName field that Administrators can update for every user. The DisplayName will default to the user's username. All GUIs or other responses should use the DisplayName as the user's name in order to avoid broadcasting potential profanity.

This will allow the user to still login with their original username and password if their DisplayName is changed