Fix issue with item generation for hidden items

[barhodes]

With this change, when generating Questionnaire items from a Profile, if a differential element does not have a type, the type from the snapshot (if available) will be used. Alternatively, if the element has child elements defined the type is ignored and a group item is created for the children elements.

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 94.52055% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 59.23%. Comparing base (a50e8eb) to head (7d524b1).

Files	Patch %	Lines
...questionnaire/generate/dstu3/ElementProcessor.java	87.50%	0 Missing and 1 partial ⚠️
...cr/questionnaire/generate/r4/ElementProcessor.java	87.50%	0 Missing and 1 partial ⚠️
...cr/questionnaire/generate/r5/ElementProcessor.java	87.50%	0 Missing and 1 partial ⚠️
...onnaireresponse/extract/ProcessDefinitionItem.java	95.23%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #441      +/-   ##
============================================
+ Coverage     59.15%   59.23%   +0.07%     
- Complexity     3163     3175      +12     
============================================
  Files           320      320              
  Lines         16496    16495       -1     
  Branches       2553     2564      +11     
============================================
+ Hits           9759     9771      +12     
+ Misses         5618     5606      -12     
+ Partials       1119     1118       -1     

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[rob-reynolds]

Tested. Expected results.