SLA archive import with miniz, marching square bugfixes

Fix compilation on Windows


Fix array subscript out of range error in MarchingSquares


Fix normals of mesh constructed from slices


Improve performance of mesh construction from slices

src/libslic3r/SLA/RasterToPolygons.hpp

@@ -8,8 +8,8 @@ namespace sla {
 
 class RasterGrayscaleAA;
 
-ExPolygons raster_to_polygons(const RasterGrayscaleAA &rst, float accuracy = 1.f);
+ExPolygons raster_to_polygons(const RasterGrayscaleAA &rst, Vec2i windowsize = {2, 2});
 
-}}
+}} // namespace Slic3r::sla
 
 #endif // RASTERTOPOLYGONS_HPP