New semantics for ExtrusionLoop objects. Early processing of perimeter overhangs for paralellizing such work and making G-code export lighter. Lots of refactoring. This should fix a number of minor bugs, including reversals of perimeter overhangs.

lib/Slic3r/ExtrusionLoop.pm

@@ -2,16 +2,4 @@ package Slic3r::ExtrusionLoop;
 use strict;
 use warnings;
 
-sub split_at {
-    my $self = shift;
-    
-    return Slic3r::ExtrusionPath->new(
-        polyline        => $self->polygon->split_at(@_),
-        role            => $self->role,
-        mm3_per_mm      => $self->mm3_per_mm,
-        width           => $self->width,
-        height          => $self->height,
-    );
-}
-
 1;