Implements a forked custom user router to make the change, since
overriding fastapi endpoints is not straightforward.

update model to contain 'password' and 'newPassword'
frontend: match model

update tests

…al routes

…tion + decoding

move auth functionality to auth.py

- move relevant functions from fastapi_user manager to users
- update modules
- remove fastapi_users, update to latest fastapi!
- still more cleanup needed, simplification where possible

- keep pydantic at 1.x for now (made some model changes that are forward compatible with 2.0)
- ensure users uses _id not id similar to all other objects (will need migration)
- remove userdb, move db functions into users
- remove generic _update, add update_verified, update_password, update_email
- webhooks: add webhooks for openapi!

- remove references to 'user_db'
- unify 'get_id' / 'get_user_by_id' to just 'get_by_id'
- fix 'id' -> '_id' reference

remove is_active from model, check for 'id' on frontend instead of unused 'is_active'

- error code pass: use more consistent lowercase errors, remove old fastapi_users error code
- use 'user_already_exists' and 'invalid_password' for dupe user and invalid password errors
- update frontend error codes checking
- rename self.collection -> self.users in UserManager

… compatibility

…for backwards compatibility

- fix doc strings
- add user.update_invites() when removing an invite
- fix logic for printing when superuser password has changed