tool changer support - init work

src/slic3r/GUI/Plater.hpp

@@ -148,6 +148,8 @@ public:
     void load_ams_list(std::string const & device, MachineObject* obj);
     std::map<int, DynamicPrintConfig> build_filament_ams_list(MachineObject* obj);
     void sync_ams_list();
+    // Orca
+    void show_add_del_filament_button(bool bshow);
 
     ObjectList*             obj_list();
     ObjectSettings*         obj_settings();