Changing the internal representation of Point / Pointf / Point3 / Pointf3 to Eigen Matrix types:

Changed the Point3 / Pointf3 to composite Eigen Vec3crd / Vec3d.
Point3 is no more derived from Point,
Pointf3 is no more derived from Pointf.
Introduced Transform2f/3f/2d/3d types as aliases to Eigen::Transform.

xs/src/libslic3r/Print.cpp

@@ -726,7 +726,7 @@ BoundingBox Print::bounding_box() const
     for (const PrintObject *object : this->objects)
         for (Point copy : object->_shifted_copies) {
             bb.merge(copy);
-            copy.translate(object->size);
+            copy.translate(object->size.xy());
             bb.merge(copy);
         }
     return bb;