Fixes for missing localIds

[JPercival]

• new IdObjectFactory that assigns an id to all objects created
  • refactoring to share the factory everywhere
• new FuntionalElmVisitor to facilitate walking the ELM graph
  • tests for same
• tests to validate that every node has a localId
• fixes to serialization of empty collections, discovered while testing the above
• fixes to data requirements processor that was dependent upon elements not having unique localIds.

There was a refactor to separate and reorder the phases of the compiler, which can be seen here: https://github.com/cqframework/clinical_quality_language/blob/bug-localId-tests/Src/java/cql-to-elm/src/main/java/org/cqframework/cql/cql2elm/CqlCompiler.java#L208-L241

Resolves #1295, #1279, #1131, #704, #697

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Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (cc869ca) 62.70% compared to head (f9b65d2) 62.79%.

Files	Patch %	Lines
.../java/org/cqframework/cql/cql2elm/elm/ElmEdit.java	80.00%	2 Missing and 2 partials :warning:
...va/org/cqframework/cql/cql2elm/LibraryBuilder.java	90.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1309 +/- ## ============================================ + Coverage 62.70% 62.79% +0.09% - Complexity 6079 6090 +11 ============================================ Files 466 468 +2 Lines 25308 25322 +14 Branches 4711 4714 +3 ============================================ + Hits 15869 15901 +32 + Misses 7288 7280 -8 + Partials 2151 2141 -10 ```

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