bm_Lightwrap BM

Author: Ben McEwan - https://benmcewan.com/blog/

• http://www.nukepedia.com/gizmos/filter/bm_lightwrap
• https://github.com/BenMcEwan/nuke_public
• https://benmcewan.com/nukeTools.html

Like bm_OpticalGlow, this adds exponentially-increasing blurs together to produce a more optically-correct, natural lightwrap.