Inconsistent ordering of GLTF JSON name property

It seems that sometimes the `name` property is written first, and sometimes last.

That's because the base class `GLTF::Object::writeJSON` is not always called in the beginning of each override writeJSON method.

` GLTF::Object::writeJSON` also writes other properties like `extras` and `extensions`.

I think it is easier to debug and read the JSON when the `name` property always comes first?

Start at the GLTF::Object::writeJSON entry point and inspect each writeJSON override to compare where the base method is called. Ensure the name property is emitted consistently before the other properties written by the base class, including extras and extensions; verify the generated glTF JSON ordering.

Written by the indexing model from the issue text.