Verify we have implemented missing converters for tuples in modelinfo

[EvanMachusak]

See #129

We should create some test code that:

• Dynamically generates Copy T functions for all T of type ClassInfo present in a ModelInfo class which creates a new named tuple and assigns all of its properties to obj's value, e.g.:

define function "Copy Patient"(obj FHIR.Patient):
  FHIR.Patient {
     id: obj.id,
     birthDate: obj.birthDate,
     ... all other elements of Patient follow ...
}

• Fix the cryptic ArgumentException that gets thrown when a conversion required for the member binding is missing, with information about which conversion is being attempted and not available
• Add all missing converters for the FHIR model

This will allow us to be sure that we can dynamically create FHIR model tuples in CQL.