nsi-core

This crate implements the high level wrapper around the NSI API and links against the commercial 3Delight renderer.

The low level wrapper around the C FFI is in the nsi-sys crate.

This crate will likely be deprecated and split into nsi-traits (describing the high level API) and nsi-3delight (the actual implementation linking agains 3Delight).

This will allow different implementations to depend on nsi-traits. For example, there could be an nsi-moonray or nsi-kajira crate.