v0.0.6

The main feature this update brings is glTF extensions! This allows you to store arbitrary extensions within the graph, and provides a framework for defining IO for a specific format.

This includes Bevy support, with a provided implementation of the OMI_physics extensions for importing and exporting physics bodies into and out of Bevy. This uses the bevy_xpbd physics engine.

Additionally most structs and traits were refactored, honestly too many changes to list here but things feel a lot better now.