Marker components filtered out of Extension export format #95
Description
Bevy 0.18 introduced the GltfExtensionHandler feature, which skein takes advantage of in addon 0.1.14+ and bevy_skein 0.5+.
It is opt-in at the moment, but is generally "the better/future option".
However, currently marker components (or any field with an empty object) are currently filtered out by Blender's gltf exporter. So while the Rust side of things will fully accept the extension-style format, Blender can't produce it in the case of Marker components (which are heavily used in Bevy).
Waiting on this upstream fix: KhronosGroup/glTF-Blender-IO#2631
We can include instructions for using the fork in the meantime if people want it.