Add support for OIDN or similar to Display pre-pass

There you go, I did it. I asked for denoiser support in Display.

Basically for multi-pass renders: render the first, 1spp quick pass as you do now. Run denoising on that. Render the final bucket passes on top of that, as before. I think the IPR in any DCC app you support would also benefit from this.

There is nothing wrong in using a denoiser for preview renders.