Add warning and support for tolerating a common problem where objects have wrong kid count.
Add support for empty texture layers.

Unit test for issue #3101

Thanks to @mvidiassov for the X3D test file!

Currently, when the coordIndex attribute of an IndexedLineSet contains a
polyline with > 2 indices, X3DGeoHelper::coordIdx_str2faces_arr() will
incorrectly determine the primitive type to be aiPrimitiveType_TRIANGLE or
aiPrimitiveType_POLYGON instead of aiPrimitiveType_LINE.

To fix this, this commit adds functions to explicitly handle an IndexedLineSet.

Fixes #3101

- closes https://github.com/assimp/assimp/issues/5403

  Cause a TypeError when arg is UNSET

fix: KHR_materials_pbrSpecularGlossiness/diffuseFactor convert to pbrMetallicRoughness/baseColorFactor

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v3...v4

)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

- closes https://github.com/assimp/assimp/issues/5340

- closes https://github.com/assimp/assimp/issues/4930

- closes https://github.com/assimp/assimp/issues/5392

- closes https://github.com/assimp/assimp/issues/5390

Added missing whitespace

Add more details about the default build.

The path to the vendored zlib is set by the build-system,
so there's no need to add additional preprocessor magic