Helper Nodes for Blender

A few nodes to help in blender, some of it is original, some compiled from other sources. Even for the ones that aren't original I tried to add something new to them.

Nodes:

Iridescent: adds iridescence and pearlescence in blender, thanks to Secrop

Abbe: Physically correct dispersion, accepts glass codes

Fresnel: a more accurate fresnel node, thanks to Cynicat

Blur: adds vector blur to images and procedurals

Retroreflection: simulates retroreflective materials

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