ENH: support filament_z_hop_types

Support override z top type in filament

This is handling for STUDIO-2082

Change-Id: I885d1d5e44d626e28b260ff569d0359e462a5f8d

src/slic3r/GUI/Field.hpp

@@ -386,6 +386,9 @@ public:
 	void			set_values(const wxArrayString &values);
 	boost::any&		get_value() override;
 
+    void set_last_meaningful_value() override;
+    void set_na_value() override;
+
     void            msw_rescale() override;
 
 	void			enable() override ;//{ dynamic_cast<wxBitmapComboBox*>(window)->Enable(); };