Extend MorphTargets to include UV and Color.

[schell]

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

renderling/crates/renderling/src/geometry.rs

Lines 25 to 26 in 9b51846

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