Sketcher: SketchObject - method to getCompleteGeometry as GeometryFacade

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As GeometryFacade is provided with more sketcher specific functionality, the demand
for to get GeometryFacades instead of Part::Geometry object increases too. This
addition reflects this increase of demand.

src/Mod/Sketcher/App/SketchObject.h

@@ -194,6 +194,8 @@ public:
     /// retrieves a vector containing both normal and external Geometry (including the sketch axes)
     std::vector<Part::Geometry*> getCompleteGeometry(void) const;
 
+    std::vector<std::unique_ptr<const GeometryFacade>> getCompleteGeometryFacade(void) const;
+
     /// converts a GeoId index into an index of the CompleteGeometry vector
     int getCompleteGeometryIndex(int GeoId) const;