* First commit: Create new branch from the release branch with changes from James' branch. This probably won't compile as the work is incomplete.
* Second round of changes from integrating James' branch.
* Mark most test failures with TODOs.
* Add whitespace
* Add changes to FhirPathR4 to set FHIRPathEngine to non-strict FP evaluation.
* Fix CreatePackageCommandTest to assert null instead of empty string. Comments on tests that fail due to the double-quote encoding problem.
* Downgrade to core 5.6.97.
* Fix another test and remove TODOs.
* Fix changelog.
* Clean up some erroneous changes and TODOs.
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Co-authored-by: Tadgh <garygrantgraham@gmail.com>
