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]

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 ⚠️
src/main/java/App.java	0%	1 Missing ⚠️

Additional details and impacted files

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

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