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

xs/src/ExtrusionEntity.hpp

@@ -1,13 +1,7 @@
 #ifndef slic3r_ExtrusionEntity_hpp_
 #define slic3r_ExtrusionEntity_hpp_
 
-extern "C" {
-#include "EXTERN.h"
-#include "perl.h"
-#include "XSUB.h"
-#include "ppport.h"
-}
-
+#include <myinit.h>
 #include "Polygon.hpp"
 #include "Polyline.hpp"
 
@@ -51,33 +45,6 @@ class ExtrusionLoop : public ExtrusionEntity
     ExtrusionPath* split_at_first_point();
 };
 
-void
-ExtrusionPath::reverse()
-{
-    this->polyline.reverse();
-}
-
-ExtrusionPath*
-ExtrusionLoop::split_at_index(int index)
-{
-    Polyline* poly = this->polygon.split_at_index(index);
-    
-    ExtrusionPath* path = new ExtrusionPath();
-    path->polyline      = *poly;
-    path->role          = this->role;
-    path->height        = this->height;
-    path->flow_spacing  = this->flow_spacing;
-    
-    delete poly;
-    return path;
-}
-
-ExtrusionPath*
-ExtrusionLoop::split_at_first_point()
-{
-    return this->split_at_index(0);
-}
-
 }
 
 #endif