read a config file and spin up a Citizen.

create a new citizen and pesist her config.

constructor.

zero value means no Peer.

a CitizenConfig is a SelfConfig, along with it's peers and a file handle.

a SelfConfig is an [oracle.Self] with an address.

A thread is a logical grouping of ordered messages.

type messageOptionFunction func(any) MessageOption.

Subjects are well-known values that indicate a type of Message and how it should be handled.