Convert Extruder object (mostly) to C++ with lots of fields.

xs/lib/Slic3r/XS.pm

@@ -221,4 +221,20 @@ use overload
     '@{}' => sub { $_[0]->arrayref },
     'fallback' => 1;
 
+package Slic3r::Extruder;
+
+sub new {
+    my ($class, %args) = @_;
+
+    $args{extruder_offset} = Slic3r::Point->new($args{extruder_offset});
+
+    return $class->_new(@args{qw(
+        id use_relative_e_distances
+        extruder_offset
+        nozzle_diameter filament_diameter extrusion_multiplier temperature
+        first_layer_temperature retract_length retract_lift retract_speed
+        retract_restart_extra retract_before_travel retract_layer_change
+        retract_length_toolchange retract_restart_extra_toolchange wipe)});
+}
+
 1;