Templates and Keep modules

[dehall]

This PR supports two "new" categories of modules:

Templates

Templates are snippets of modules intended to help authors create a new module quickly. A corresponding change to the module builder (synthetichealth/module-builder#329) adds the ability to load these templates. After submitting this PR I will put together some documentation on how to use these to create a new module.

Keep Modules

Keep modules have been supported for a while; this PR adds a set of built-in keep modules and updates the -k flag to support either arbitrary paths or these built-in ones. We had two already must_have_cabg.json and must_have_cardiac_surgery.json which I moved from the repo root to this new directory so any existing scripts that reference them can still work without changes. This should work both running via gradle/run_synthea or as a JAR file.

Tech Notes:

• I migrated Module.fixPathFromJar into the Utilities class since I was using it in App as well now
• Changed Generator.keepPatientsModulePath from File to Path since you can't reference files in a zip/jar as a File

[codecov]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (85673df) 76% compared to head (649eb82) 77%.

Files	Patch %	Lines
...main/java/org/mitre/synthea/helpers/Utilities.java	11%	7 Missing and 1 partial ⚠️
src/main/java/App.java	0%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #1403    +/-   ##
=========================================
  Coverage        76%     77%            
- Complexity     3850    3873    +23     
=========================================
  Files           178     178            
  Lines         24997   25002     +5     
  Branches       3535    3536     +1     
=========================================
+ Hits          19136   19274   +138     
+ Misses         4735    4615   -120     
+ Partials       1126    1113    -13     

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