Flexporter enhancements

[dehall]

This PR adds a few enhancements identified when trying to create "Not Done" type resources for QICore. (Ex, Medication Not Requested https://build.fhir.org/ig/HL7/fhir-qi-core/StructureDefinition-qicore-medicationnotrequested.html )

• Disables the annoying warning the flexporter introduced. For a single patient it wasn't that big a deal but for larger populations it made it impossible to follow the output.
• Adds a "fullUrl" field to the Bundle entry on any created resources
• When creating resources based on a given state, adds the ability to reference the Encounter that was active at that time
• Adds a specific "No Aspirin" state to the ACS Discharge Meds submodule for the flexporter to key off of for this example. We may want to make it a "best practice" to have an actual empty simple-type state in modules when a treatment option is skipped, to make it easier to identify.
• Adds a flexporter mapping in src/test/resources with a new Not Done example. Try running it with ./run_synthea -fm src/test/resources/flexporter/qicore_withnotdone.yaml -k must_have_cardiac_surgery.json -a 55-65

[codecov[bot]]

Codecov Report

Attention: 28 lines in your changes are missing coverage. Please review.

Comparison is base (85673df) 76% compared to head (8ded418) 77%.

Files	Patch %	Lines
...a/org/mitre/synthea/export/flexporter/Actions.java	25%	23 Missing and 4 partials :warning:
src/main/java/App.java	0%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1402 +/- ## ========================================= Coverage 76% 77% - Complexity 3850 3875 +25 ========================================= Files 178 178 Lines 24997 25034 +37 Branches 3535 3546 +11 ========================================= + Hits 19136 19277 +141 + Misses 4735 4641 -94 + Partials 1126 1116 -10 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.