[Bf-cycles] Volumetric patch update (now with new shiny bidirectional integrator)

[storm]

Forgot to merge main SSS part, now it actually work when "No
bidirectional" turned on. No support of BSSRFS in bidirectional tracer,
i need to reconsider more some parts. Maybe i need treat it as another
light.

Must note, great work, Brecht, it really fast, especially with
comparison to multi scattering with many bounces solutions . New skin
era begin for Cycles!
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