Address FHIR-specific mapping expansion workaround

[brynrhodes]

The applyTargetMap() method in the LibraryBuilder has some FHIR-specific mapping workarounds to account for deficiencies in the ModelInfo mapping capability. Provide support in the ModelInfo mapping to address these issues:

https://github.com/cqframework/clinical_quality_language/blob/master/Src/java/cql-to-elm/src/main/java/org/cqframework/cql/cql2elm/LibraryBuilder.java#L2571