Skecher: Rendering order

========================

Recently the rendering order functionality was temporarely removed, as it interferred with the development of visual layers.

However, the release comes before visual layers are finished and can provide such functionality.

This commit reintroduces the functionality for the release.

src/Mod/Sketcher/Gui/Workbench.cpp

@@ -511,7 +511,8 @@ template <>
 inline void SketcherAddWorkbenchEditTools<Gui::ToolBarItem>(Gui::ToolBarItem& edittools)
 {
     edittools   << "Sketcher_Grid"
-                << "Sketcher_Snap";
+                << "Sketcher_Snap"
+                << "Sketcher_RenderingOrder";
 }
 
 void addSketcherWorkbenchSketchActions(Gui::MenuItem& sketch)