Update HomeCareObservationDocumentReference

[tmsMedcom]

The following elements must be addressed:

• masterIdentifier.value - a nonspecific uuid is added now
• type - create a valueset for the possible types (should be done in the terminology-IG: https://build.fhir.org/ig/medcomdk/dk-medcom-xds-metadata/artifacts.html)
• content.format - define formatCode in a valueset
• context.event - define the eventCodeList for HomeCareObservations.

Example (currently with APD-DK codes) can be found here: https://build.fhir.org/ig/medcomdk/dk-medcom-ihe-xds-metadata/DocumentReference-77787891-083a-4d19-9e56-423e7a223e30.html

[tmsMedcom]

IG: https://build.fhir.org/ig/medcomdk/dk-medcom-ihe-xds-metadata/index.html