Extend MorphTargets to include UV and Color.

[schell]

I think this would take a contribution to the gltf crate.

renderling/crates/renderling/src/stage.rs

Lines 92 to 93 in 1ab3eeb

	// TODO: Extend MorphTargets to include UV and Color.
	// I think this would take a contribution to the `gltf` crate.