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notes:
* patch_blending_vignette cache is cleared post node execution
* new GenParams cleans up args in function, and allows easier adjustments to args if the need arises.
* v0 uses jena2020, ignoring blend_into_patch option.
!! v0 output seemed bizarre on some tests, might have introduced a bug when refactoring...
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to think about:
* when generating cut mask, output it as single channel instead. blend_into_patch added redundant operation.
* overlap can be small with respect to the block_size, perhaps it is better to handle individual corners in get_4way_min_cut_patch?
* maybe add seed or generator to GenParams.
Bruno Madeira
881b5c0577