Add an NSI C API for scene description

[virtualritz]

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So that you can instantly interface with Maya, Houdini, Katana and Cinema 4D.

[Twinklebear]

That'd be pretty cool! It'd be worth checking out USD support too, both of these could probably be added as a Scene importer

[virtualritz]

Well, for now Maya has the best USD support via Multiverse (which is free). In fact, Multiverse is optimized for working with NSI through Maya.

Also there will soon be an Alembic NSI procedural. An USD procedural will come after.

The Multiverse guys also wrote a Hydra USD delegate for NSI. So you can go USD->Hydra->NSI.

This is the whole API btw.