Application Scaling for MSW: Next big step

- Added rescale() function for the most of controls
 - Created PrusaBitmap and PrusaButton classes like a wrap to wxBitmap and wxButton accordingly

src/slic3r/GUI/GUI_ObjectList.hpp

@@ -285,6 +285,9 @@ public:
     void rename_item();
     void fix_through_netfabb() const;
     void update_item_error_icon(const int obj_idx, int vol_idx) const ;
+
+    void rescale();
+
 private:
     void OnChar(wxKeyEvent& event);
     void OnContextMenu(wxDataViewEvent &event);