Ported Polygon->is_counter_clockwise() and rearranged code in .cpp files

xs/src/Polyline.hpp

@@ -1,13 +1,6 @@
 #ifndef slic3r_Polyline_hpp_
 #define slic3r_Polyline_hpp_
 
-extern "C" {
-#include "EXTERN.h"
-#include "perl.h"
-#include "XSUB.h"
-#include "ppport.h"
-}
-
 #include "Line.hpp"
 #include "MultiPoint.hpp"
 
@@ -20,16 +13,6 @@ class Polyline : public MultiPoint {
 
 typedef std::vector<Polyline> Polylines;
 
-Lines
-Polyline::lines()
-{
-    Lines lines;
-    for (int i = 0; i < this->points.size()-1; i++) {
-        lines.push_back(Line(this->points[i], this->points[i+1]));
-    }
-    return lines;
-}
-
 }
 
 #endif