Admin is the role that can change all lower roles except for adding and removing administrators.

Denied is a blacklisted user who may not read from or write to the relay.

None is the tombstone event that puts the user in the same role as an unauthenticated user (which may mean the same as Denied in effect).

Owner is the role of a user who has all privileges except for altering others with the same role.

Reader is a user who may search and retrieve events from the relay.

Writer is a user who has the right to add events to the relay.

RoleStrings are the human readable form of the role enums.