All: use CPOLYGONS_LIST, a typedef of std::vector<CPolyPt> to handle a Corners Polygons List.

This is a starting point of some code enhancements relative to polygons in Pcbew and 3D viewer.

pcbnew/zone_filling_algorithm.cpp

@@ -55,7 +55,7 @@
  */
 
 bool ZONE_CONTAINER::BuildFilledSolidAreasPolygons( BOARD* aPcb,
-                            std::vector <CPolyPt>* aCornerBuffer )
+                            CPOLYGONS_LIST* aCornerBuffer )
 {
     if( aCornerBuffer == NULL )
         m_FilledPolysList.clear();