Macaroon ID Protocol Buffers

This module defines the serialization format of macaroon identifiers for macaroons created by the macaroon-bakery. For the most part this encoding is considered an internal implementation detail of the macaroon-bakery and external applications should not rely on any of the details of this encoding being maintained between different bakery versions.

This is broken out into a separate module as the protobuf implementation works in such a way that one cannot have multiple definitions of a message in any particular application's dependency tree. This module therefore provides a common definition for use by multiple versions of the macaroon-bakery to facilitate easier migration in client applications.