Add tests for parsing Paratext project settings

[pmachapman]

Fixes #295

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This change is 

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.59%. Comparing base (25e2fbf) to head (7dac10b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #311      +/-   ##
==========================================
+ Coverage   91.56%   91.59%   +0.02%     
==========================================
  Files         355      357       +2     
  Lines       23127    23153      +26     
==========================================
+ Hits        21177    21206      +29     
+ Misses       1950     1947       -3     

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[Enkidu93]

@Enkidu93 reviewed 7 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on ddaspit).

[ddaspit]

@ddaspit reviewed 7 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on pmachapman).