DeepMerge_Advanced [BM]

Author: Ben McEwan - https://benmcewan.com/nukeTools.html

• https://github.com/BenMcEwan/nuke_public/tree/master/gizmos

• Merges all channels from A and B in deep

• Fixes issue with DeepMerge's holdout operation which exists in Nuke 11
• Choose between a Deep or 2D output
• Soften/Blur slider which helps blend the 2 deep renders using a DeepExpression and deep.front and deep.back