bmsnav fixes

[steven11sjf]

• researched and documented most parts of the mesh
• fixed some bools misclassified as bytes in bmslink
• fixed a (int1, int15) being read as a short in polycollection2d bst's

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.83%. Comparing base (432e5b9) to head (58033cf).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #246      +/-   ##
==========================================
- Coverage   76.84%   76.83%   -0.02%     
==========================================
  Files          78       78              
  Lines        3874     3872       -2     
==========================================
- Hits         2977     2975       -2     
  Misses        897      897              

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