Ensure compatibility with UniGLTF in one project

[hybridherbst]

Describe the bug 💬

See

• ParticleSystemBakeMeshOptions not existing in the current context #789 (comment)
• Improve glTF plugin compatibility with newer ScriptedImporterAttribute syntax vrm-c/UniVRM#1576

Currently, UnityGLTF can coexist with glTFast and also with GLTFUtility, but not with UniGLTF.
Ideally, UnityGLTF as the more mature importer/exporter should have priority, but that requires UniGLTF cooperation.

Otherwise, we can give UniGLTF default priority without their cooperation, to resolve the issue when there are multiple importers in one project.

Steps to reproduce 🔢

1. Add UniGTLF to project
2. Add UnityGLTF to project

Note Unity warnings about all default importers being rejected for .glb.

Files to reproduce the issue ♻

No response

Editor Version 🎲

2022.3

Render Pipeline and version

BiRP, URP

UnityGLTF Version

2.14.0

Operating System 👩‍💻

Windows, macOS

When does this problem happen?

• Editor Import
• Runtime Import
• Editor Export
• Runtime Export

Additional Info 📜

No response

Validations 🩹

• I have searched existing issues: no issue already exist that reports the same problem.
• I follow the Code of Conduct
• I provided a minimal reproducible example, including files when necessary.

[hybridherbst]

Fixed in a future UniGLTF release

• add version defines so that UniGLTF, UnityGLTF and glTFast can co-exist vrm-c/UniVRM#2461 (comment)