* First working brim ear impl, ported from SuperSlicer
* Make brim ears configurable
* Generate ears only if ear size > 0
* Fix `Polygon::convex_points` as well as brim ear max angle
* Fix another error in `Polygon::convex_points` and `Polygon::concave_points`
* Apply brim ears to inner brims as well
* tweak hide and disable condition a bit
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Co-authored-by: SoftFever <softfeverever@gmail.com>
Similar to tree support, make as many steps parallel as possible.
Jira: STUDIO-2525
Change-Id: Iee310bbf6911d8d3e4262ee8ed6bd133d09670a9
(cherry picked from commit 3798f1a3ecb85bbfb81925b3702fb4384e18994d)
