1.7.0 for R5 (release 20200507)

This is the beta release for FHIR Release R5: Preview 2 (http://hl7.org/fhir/2020May/).

Resource Citation is left out of this release, because it caused too much compile errors.

⚠️ Please take care of using this release, because it is still a beta release and not to be used for production.