Replaced Point3 with Eigen Vec3crd, removed Point3 from the Perl binding.

xs/lib/Slic3r/XS.pm

@@ -33,16 +33,6 @@ use overload
     '@{}' => sub { $_[0]->arrayref },
     'fallback' => 1;
 
-package Slic3r::Point3;
-use overload
-    '@{}' => sub { [ $_[0]->x, $_[0]->y, $_[0]->z ] },  #,
-    'fallback' => 1;
-
-sub pp {
-    my ($self) = @_;
-    return [ @$self ];
-}
-
 package Slic3r::Pointf;
 use overload
     '@{}' => sub { $_[0]->arrayref },