Fix vet and lint comments.
Rename TrackingId to TrackingID.
Rename cargo.CargoRepository to cargo.Repository.
Rename location.LocationRepository to location.Repository.
Rename voyage.VoyageRepository to voyage.Repository.
cargo: Fix lint issues.
location: Fix lint issues.
Rename voyage.VoyageNumber to voyage.Number.
Fix lint issues.
interfaces: Fix lint errors.