[CURA-10500] simplify fixes

[rburema]

Things that where probably causing jagged edges:

• Bridging (which is on for first-party printers) could chop up line segments almost to the 5 micron level.
• The iteration when simplifying wasn't exhaustive. Especially, there was a check to see if we where still below 2 or 3 for polylines and polygons respective, but the corresponding remove didn't always. You'll note that we also completely iterate a number of times. If it's determined that this diminishes the deviation checks too much, we can probably just leave it at the > 0 check (instead of > #min_nr_of_vertices) for by_importance.
• We where also not sure about the squared version of the line-distance, since those give different answers when a square-root was taken compared to the non-squared version.

At the moment I think this is enough to not introduce jaggies into polygons or polylines that are not themselves fine details. There are still some small lines that ping the checker, bit those seem a bunch of small polylines (which have fixed endpoints) that you'd need to have one or more special cases for, since you either do need to remove the end-points then, or accept that in those cases some deviation is accepted (like throwing away paths that are not by much, but still, above the minimum length).

[github-actions[bot]]

Unit Test Results

25 tests  ±0   25 :heavy_check_mark: ±0   15s :stopwatch: -1s   1 suites ±0     0 :zzz: ±0    1 files   ±0     0 :x: ±0 

Results for commit e6ba62ed. ± Comparison against base commit 7b905648.

:recycle: This comment has been updated with latest results.