First prototype of adding of UI for frequently changed parameters

xs/src/slic3r/GUI/GUI.hpp

@@ -17,6 +17,7 @@ class wxArrayString;
 class wxArrayLong;
 class wxColour;
 class wxBoxSizer;
+class wxFlexGridSizer;
 
 namespace Slic3r { 
 
@@ -127,6 +128,8 @@ wxString	from_u8(const std::string &str);
 
 wxWindow *get_widget_by_id(int id);
 
+void add_frequently_changed_parameters(wxWindow* parent, wxBoxSizer* sizer, wxFlexGridSizer* preset_sizer);
+
 }
 }