Login, add more features to the user

[DanielHammar]

Needed features:

• [x] RBAC implementation
• [x] Fetch user role
• [x] Fetch active user
• [x] Control that it is the right owner

[Hundmat]

The system of RBAC is now working --> for sellers and other users seller can sell objects and other can not.

We will add workability for brokers when MVP is done