Swift Package Manager configuration

Add Swift Package Manager (SPM) that enables package dependency configuration in Xcode 11.

Update to FHIR R4 and Swift 4.2

Supports FHIR R4 data models using Swift 4.2.

Swift 3.2 for STU-3

3.2.0

Fix compiler warnings, update submodules

Swift 3 for STU-3

The Triple Three: version 3.0 for FHIR STU-3 in Swift 3.

Swift 3 and FHIR DSTU-2

Represents FHIR DSTU-2 data models in Swift 3.

Swift 2.3 and FHIR DSTU-2

A one-off, not supported release for FHIR DSTU-2 data models in Swift 2.3.

Swift 2.2 and FHIR DSTU-2

Data models for FHIR DSTU-2 version in Swift 2.2.