NEW:new fialment load/unload process

jira:[none]

Change-Id: Ie0076d5c7ec619414121c1f6d37876aaa4e044c1
(cherry picked from commit 5d9a7eaadcd5ab6dc2f18e65000ead81e7e8adb6)

src/slic3r/GUI/Widgets/StepCtrl.hpp

@@ -103,4 +103,28 @@ private:
     void doRender(wxDC &dc) override;
 };
 
+
+class FilamentStepIndicator : public StepCtrlBase
+
+{
+    ScalableBitmap bmp_ok;
+    wxBitmap bmp_extruder;
+    wxString m_slot_information = "";
+
+public:
+    FilamentStepIndicator(wxWindow* parent,
+        wxWindowID      id,
+        const wxPoint& pos = wxDefaultPosition,
+        const wxSize& size = wxDefaultSize,
+        long            style = 0);
+
+    virtual void Rescale();
+
+    void SelectNext();
+    void SetSlotInformation(wxString slot);
+private:
+    void doRender(wxDC& dc) override;
+};
+
+
 #endif // !slic3r_GUI_StepCtrlBase_hpp_