Each stage should only respond to its own stage invalidation notices. #199
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Before this branch, all proxy shape scene indices would respond to all stage invalidate notifications, which is incorrect.
An invalidated proxy shape will rebuild all its Hydra prims, and for some reason they are rebuilt incorrectly, without the native instancing instancers, so the native instances disappear. This is another, latent bug, which is not fixed by this pull request, as it is out of scope, but this pull request avoids the latent bug.