Reproducible IDs for FHIR resources and CCDA elements.

[hadleynet]

This pull request builds on recent work to improve the reproducibility of generated records when using the same patient seed, provider seed and reference date. This pull request introduces reproducible resource and element ids so diffing two sets of generated patients will not yield differences resulting from random ids.

To test:

./run_synthea -p 10 -s 5 -cs 10 -r 20200701
mv output/fhir output/fhir2
./run_synthea -p 10 -s 5 -cs 10 -r 20200701

Diff the corresponding files in output/fhir and output/fhir2.

[codecov]

Codecov Report

Merging #760 into master will decrease coverage by 0%.
The diff coverage is 87%.

@@           Coverage Diff            @@
##             master    #760   +/-   ##
========================================
- Coverage        81%     81%   -1%     
- Complexity     2693    2711   +18     
========================================
  Files           101     101           
  Lines         16856   16866   +10     
  Branches       2325    2325           
========================================
- Hits          13701   13679   -22     
- Misses         2445    2490   +45     
+ Partials        710     697   -13     

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/org/mitre/synthea/engine/Generator.java	80% <0%> (-3%)	63 <0> (-2)
.../org/mitre/synthea/export/FhirGroupExporterR4.java	11% <0%> (ø)	3 <0> (ø)
...tre/synthea/export/FhirPractitionerExporterR4.java	5% <0%> (ø)	2 <0> (ø)
...g/mitre/synthea/helpers/RandomNumberGenerator.java	42% <ø> (ø)	6 <0> (ø)
.../java/org/mitre/synthea/world/agents/Provider.java	89% <ø> (+<1%)	55 <0> (+1)
...va/org/mitre/synthea/world/geography/Location.java	72% <ø> (ø)	46 <0> (ø)
...in/java/org/mitre/synthea/datastore/DataStore.java	82% <85%> (-5%)	28 <0> (-1)
...c/main/java/org/mitre/synthea/export/FhirStu3.java	84% <89%> (+<1%)	155 <1> (+3)
src/main/java/org/mitre/synthea/export/FhirR4.java	86% <93%> (+<1%)	191 <1> (+2)
.../main/java/org/mitre/synthea/export/FhirDstu2.java	87% <94%> (+2%)	116 <1> (+3)
... and 25 more

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