Implement AssetPipeline::parameterize() using xatlas. (#1167)
Implement AssetPipeline::parameterize() using xatlas. (#1167)

This feature consumes a flattened glTF asset and produces a glTF asset
with new topology and an additional set of UV coordinates suitable for
baking light maps.

I verified with a couple glTF models that the generated assets are
visually equivalent to the source assets, even though the topology and
scene hierarchy is different.

The actual light baking is not yet implemented, but this is a major step
towards that goal.
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