Architecture: User roles

[megastary]

User story

As a supplier user, who is also optionally end user, I would expect to be able to do everything as end user.
As an admin, who is also optionally end user, I would expect to be able to do everything as end user.
As an admin, who is also optionally supplier user, I would expect to be able to do everything as supplier user.

Acceptance criteria

• As a supplier, I can also do everything as a customer.
• As an admin, I can also do everything as a customer.
• As an admin, I can also do everything as a supplier.