Replaced parameters wall_add_middle_threshold and wall_split_middle_threshold with automatic computation based on extrusion width.

That allows computed better values in cases when the extrusion width of the first layer or for the infill differs from the extrusion width for perimeters.

Parameters min_feature_size and wall_transition_length now can be set in percentages, and then they will be calculated based on nozzle size. Old profiles with default values are forced to replace old default values with new default values in percentages.

src/libslic3r/Fill/Fill.cpp

@@ -388,6 +388,7 @@ void Layer::make_fills(FillAdaptive::Octree* adaptive_fill_octree, FillAdaptive:
         params.anchor_length_max = surface_fill.params.anchor_length_max;
         params.resolution        = resolution;
         params.use_arachne       = perimeter_generator == PerimeterGeneratorType::Arachne && surface_fill.params.pattern == ipConcentric;
+        params.layer_height      = m_regions[surface_fill.region_id]->layer()->height;
 
         for (ExPolygon &expoly : surface_fill.expolygons) {
 			// Spacing is modified by the filler to indicate adjustments. Reset it for each expolygon.