FHIRModels Versions Save

This release adds modules for the recently published FHIR R5 (5.0.0) release and the previous FHIR R4B (4.3.0) release. These can be accessed using import ModelsR5 and import ModelsR4B, respectively.

This is a maintenance release that addresses some issues and introduces small enhancements.

• BREAKING CHANGES: fix duplicate code system names resulting in https://github.com/apple/FHIRModels/issues/11
• BREAKING CHANGES: regenerate R4 models to resolve https://github.com/apple/FHIRModels/issues/15
• Update build models to 4.6.0-048af26
• Enhancement: make dates & times conform to Comparable and ExpressibleAsNSDate
• Fix an issue where times with milliseconds were not proper ISO formatted in certain locales