Support daughter Paratext projects

[Enkidu93]

Ports sillsdev/machine.py#267.

Necessary for sillsdev/serval#854.

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This change is 

[ddaspit]

@ddaspit reviewed 18 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on Enkidu93).

[codecov-commenter]

Codecov Report

❌ Patch coverage is 67.46032% with 41 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.79%. Comparing base (41bd65e) to head (5899ece).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...c/SIL.Machine/Corpora/ParatextBackupTermsCorpus.cs	41.66%	6 Missing and 1 partial ⚠️
...rc/SIL.Machine/Corpora/ParatextBackupTextCorpus.cs	53.33%	6 Missing and 1 partial ⚠️
src/SIL.Machine/Corpora/ParatextProjectSettings.cs	82.75%	3 Missing and 2 partials ⚠️
src/SIL.Machine/Corpora/ParatextTextCorpus.cs	61.53%	4 Missing and 1 partial ⚠️
...a/FileParatextProjectVersificationErrorDetector.cs	0.00%	4 Missing ⚠️
...L.Machine/Corpora/ZipParatextProjectTextUpdater.cs	0.00%	4 Missing ⚠️
...ra/ZipParatextProjectVersificationErrorDetector.cs	0.00%	4 Missing ⚠️
...lysis/ZipParatextProjectQuoteConventionDetector.cs	0.00%	4 Missing ⚠️
...chine/Corpora/ParatextProjectSettingsParserBase.cs	96.55%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #388      +/-   ##
==========================================
- Coverage   72.81%   72.79%   -0.03%     
==========================================
  Files         424      424              
  Lines       36209    36309     +100     
  Branches     4996     5006      +10     
==========================================
+ Hits        26367    26431      +64     
- Misses       8740     8770      +30     
- Partials     1102     1108       +6     

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