Added support for graphics on Edge.Cuts layer in modules. Tested functionality that works fine:

- zone filling algorithm
- printing
- plotting (pdf & gerbers)
- SVG export
- Specctra export
- 3D viewer

pcbnew/zones_convert_brd_items_to_polygons_with_Boost.cpp

@@ -297,13 +297,13 @@ void ZONE_CONTAINER::AddClearanceAreasPolygonsToPolysList( BOARD* aPcb )
 
     /* Add module edge items that are on copper layers
      * Pcbnew allows these items to be on copper layers in microwave applictions
-     * This is a bad thing, but must be handle here, until a better way is found
+     * This is a bad thing, but must be handled here, until a better way is found
      */
     for( MODULE* module = aPcb->m_Modules;  module;  module = module->Next() )
     {
         for( BOARD_ITEM* item = module->GraphicalItems();  item;  item = item->Next() )
         {
-            if( !item->IsOnLayer( GetLayer() ) )
+            if( !item->IsOnLayer( GetLayer() ) && !item->IsOnLayer( EDGE_N ) )
                 continue;
 
             if( item->Type() != PCB_MODULE_EDGE_T )