* 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>
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