SF-3582 Investigate causes of invalid chapters

[pmachapman]

This PR:

• Adds scripts to help investigate causes of invalid chapters in Scripture Forge.
• Updates the roundtrip tool to scan Paratext project directories and diagnose why Scripture Forge will mark texts invalid.
• Fixes the roundtrip tool and commit generator not running on Linux.

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This change is 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.18%. Comparing base (d0ff8ed) to head (fb21ea0).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3485   +/-   ##
=======================================
  Coverage   82.18%   82.18%           
=======================================
  Files         611      611           
  Lines       36449    36449           
  Branches     5981     5981           
=======================================
  Hits        29957    29957           
  Misses       5623     5623           
  Partials      869      869           

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