clockwise option, joint is awake

[erincatto]

• b3MeshDef gets stride and clockwise option
• Added b3Joint_IsAwake
• Added b3Body_TimeOfImpactMover
• b3MeshDef options #116
• Smoother mover collision: Mover backside collision #141
• Shape casts now ignore backside collision on mesh and height-field triangles, same as ray casts.
• Mover collision now includes triangle information.

[Copilot]

Pull request overview

This PR extends Box3D’s mesh and character-mover APIs by adding support for strided mesh vertex input, an option to interpret clockwise index winding, a joint awake-query helper, and a new body-vs-mover time-of-impact query—backed by new/expanded tests and sample updates.

Changes:

• Add b3MeshDef::stride and b3MeshDef::clockWiseWinding, and update mesh creation/welding to read vertices with a stride and optionally flip winding.
• Add b3Joint_IsAwake and b3Body_TimeOfImpactMover (with a new b3BodyTOIResult public type) plus new unit tests.
• Update samples and mover user-data to support push filtering and visualize mover TOI impacts.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/test_mesh.c	New tests covering mesh stride, welding + stride, and clockwise-winding behavior.
test/test_body_query.c	Adds unit tests for b3Body_TimeOfImpactMover across hit/separated/overlap/filtering cases.
test/main.c	Registers the new MeshTest in the test runner.
test/CMakeLists.txt	Adds test_mesh.c to the test build.
src/mesh.c	Implements strided vertex reads, updates welding, adds clockwise winding option, and adds stride validation.
src/joint.c	Adds b3Joint_IsAwake and applies minor formatting cleanups.
src/body.c	Adds b3Body_TimeOfImpactMover and minor formatting cleanups.
samples/sample_joint.cpp	Adds a new “Fold Out” joints sample and tweaks existing samples.
samples/sample_character.cpp	Renames/expands mover sample and adds TOI visualization/respawn behavior.
samples/mover.h	Extends mover shape user data with canMoverPush.
samples/mover.cpp	Skips applying push impulses to shapes marked canMoverPush == false.
include/box3d/types.h	Adds b3BodyTOIResult, documents TOI point space, and extends b3MeshDef with stride/winding.
include/box3d/math_functions.h	Adjusts b3GetLengthAndNormalize to match b3Normalize’s small-vector handling.
include/box3d/box3d.h	Exposes b3Body_TimeOfImpactMover and b3Joint_IsAwake in the public API.
.github/issue_template.md	Expands issue template guidance.

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