Deduplicate Codings in Logical Model Types
Deduplicate Codings in Logical Model Types

In logical models we convert CodeableConcept to Coding.  When there is a choice between CodeableConcept and Coding, it gets converted to a choice of two Codings.  This doesn't make sense (and violates FHIR constrates) so we deduplicate to one Coding.

Fixes hl7/us-breastcancer#5

standardhealth/shr-fhir-export,standardhealth/shr-fhir-export