Casbin is implemented slightly wrong

[SuitablyMysterious]

Currently (until 063829f), Casbin was implemented to store all user data, not just the user and role it was designed for. To fix this, I have added a separate casbin_users table to allow separation of user permissions and user data.

Required Changes:

• Change the db_init files to correct the postgres tables
• Edit the User class to accomodate this
• Change the API endpoints

Any other suggestions @HippoProgrammer?

Further documentation to follow:

[SuitablyMysterious]

Note, I believe that this is the cause of the authentication errors in backend