Nicer style for tables

[adamchalmers]

Adds a header for the Bounding Box tables, and also makes all tables look a lot more stylish.

Before:

After:

[codecov]

Codecov Report

❌ Patch coverage is 5.71429% with 33 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.40%. Comparing base (80f34f0) to head (e7c440d).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/cmd_kcl.rs	0.00%	33 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1506      +/-   ##
==========================================
- Coverage   68.77%   68.40%   -0.37%     
==========================================
  Files          41       41              
  Lines        6715     6738      +23     
==========================================
- Hits         4618     4609       -9     
- Misses       2097     2129      +32     

Flag	Coverage Δ
unittests	68.40% <5.71%> (-0.37%)	⬇️

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