Add support for per-chapter remarks

[pmachapman]

Part of sillsdev/serval#905

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This change is 

[codecov-commenter]

Codecov Report

❌ Patch coverage is 97.61905% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 73.04%. Comparing base (a272952) to head (fc18cf3).

Files with missing lines	Patch %	Lines
src/SIL.Machine/Corpora/UpdateUsfmParserHandler.cs	97.61%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #408      +/-   ##
==========================================
+ Coverage   73.02%   73.04%   +0.02%     
==========================================
  Files         439      439              
  Lines       36693    36721      +28     
  Branches     5039     5045       +6     
==========================================
+ Hits        26794    26822      +28     
  Misses       8787     8787              
  Partials     1112     1112              

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