Support daughter Paratext projects

[Enkidu93]

Also, port sillsdev/machine#381.

Related to sillsdev/serval#854 and sillsdev/silnlp#929.

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This change is 

[Enkidu93]

Needed for sillsdev/silnlp#946

[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.11765% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.49%. Comparing base (1c6bde6) to head (a7cfefb).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
machine/corpora/paratext_backup_text_corpus.py	62.50%	3 Missing ⚠️
machine/corpora/paratext_text_corpus.py	71.42%	2 Missing ⚠️
machine/corpora/paratext_project_settings.py	94.44%	1 Missing ⚠️
...e/corpora/paratext_project_settings_parser_base.py	95.23%	1 Missing ⚠️
...chine/corpora/zip_paratext_project_text_updater.py	75.00%	1 Missing ⚠️
...ora/zip_paratext_project_versification_detector.py	75.00%	1 Missing ⚠️
.../zip_paratext_project_quote_convention_detector.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #267      +/-   ##
==========================================
+ Coverage   90.75%   91.49%   +0.73%     
==========================================
  Files         355      355              
  Lines       22677    22800     +123     
==========================================
+ Hits        20581    20861     +280     
+ Misses       2096     1939     -157     

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