Add support for inline regex questions

[jacbn]

Enables regex as a question type to be marked inline. Uses the same entry field as string match; some typing is technically incorrect because of this (i.e. TS assumes the question is a StringMatchQ as opposed to a RegexMatchQ), but only base class props are used so this is not an issue. Might genericise in future if necessary.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 38.87%. Comparing base (dbb6d6a) to head (d81c4ff).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...onents/elements/markup/portals/InlineEntryZone.tsx	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1397      +/-   ##
==========================================
- Coverage   38.87%   38.87%   -0.01%     
==========================================
  Files         456      456              
  Lines       19916    19920       +4     
  Branches     5861     6517     +656     
==========================================
  Hits         7743     7743              
- Misses      12133    12137       +4     
  Partials       40       40              

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