Refactored Line objects to arrayrefs

lib/Slic3r/Point.pm

@@ -12,6 +12,8 @@ sub new {
     } elsif ($_[0]->isa(__PACKAGE__)) {
         return $_[0];
     } else {
+        use XXX;
+        ZZZ "test";
         die "Invalid arguments for ${class}->new";
     }
     bless $self, $class;