Main changes:
- Obligation codes fixed
- Obligation URL fixed
- Invariant pat-cnt-2or3-char error fixed
- Fixed typos
- Fixed ConceptMap.sourceUri and ConceptMap.targetUri errors
- Changed pattern discriminator to value
- Implemented a workaround to fix the issue with polymorphic element for R5 extension
- Bundle profile: changed the cardinality of the Patient slice to ..* (fix)
- Added missing example binding for Patient.animal
- Updated some non-required value sets (Body Structure site laterality; site Qualifier; Specimen Types; Lab Technique )