[Bf-cycles] Bidirectional patch update

[storm]

I got first image that visualy look same as in vanilla Cycles PT, many
stupid things fixed. Going to try MLT-like sampler later, for now only
uniform works. Need to check light part chain contribution, not sure it
have proper weights.

Render speed it terrible, many redundant copies of data, and i get first
smple image in viewport with stripes, sure there is uninitialized
variable somewhere, that later will be overwriten and it "somewhat
work".

Only mutations number = 1 makes sense, ignore other values.

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