Rename meta headers to All.hpp

[jslee02]

Renames every auto-generated all.hpp legacy meta header (except dart8/dartpy8) to All.hpp so the public headers match the PascalCase convention used throughout the dart/ and python/dartpy/ trees. The CMake helper is updated to emit All.hpp, dart/All.hpp replaces the lowercase umbrella, and every include/doc reference now points to the new casing.

Validated with pixi run lint.

---

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• Run pixi run test-all to lint, build, and test your changes
• Add unit tests for new functionality
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.95%. Comparing base (6d563bd) to head (06d6af9).
⚠️ Report is 354 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2166   +/-   ##
=======================================
  Coverage   61.95%   61.95%           
=======================================
  Files         393      393           
  Lines       33207    33207           
  Branches     4139     4139           
=======================================
  Hits        20572    20572           
  Misses      12635    12635           

Flag	Coverage Δ
unittests	61.95% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
dart/utils/VskParser.cpp	73.81% <ø> (ø)
dart/utils/mjcf/MjcfParser.cpp	82.35% <ø> (ø)

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[chatgpt-codex-connector]

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[jslee02]

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[chatgpt-codex-connector]

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