Minimize bad cases CU-86c3mbjx8

[big-nacho]

Description:

Changes how the boolean operations are performed. Instead of subtracting the next path from the current, we use a different approach that always subtracts from a rectangle covering the image + some padding. This helps reduce the amount of overlapping edges between the two paths involved in the boolean operation, which seems to be a big contributing factor to the creation of holes.

With this change I haven't seen holes created, but it does fail sometimes (same as before, maybe a bit more). In that case, we accept however many paths we could make disjoint and the rest are left untouched. In many cases (photographs, clip art with lots of raster content) results will be partially layered. But that should be outweighed by the fact that for most clip art illustrations, simpler, separate paths should be created.

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