Removed the "Quick Slice" menu items from the main menu,

a little bit of code cleaning / refactoring.

src/slic3r/GUI/MainFrame.hpp

@@ -12,18 +12,13 @@
 #include "Plater.hpp"
 #include "Event.hpp"
 
-class wxMenuBar;
 class wxNotebook;
-class wxPanel;
-class wxMenu;
 class wxProgressDialog;
 
 namespace Slic3r {
 
 class ProgressStatusBar;
 
-// #define _(s)    Slic3r::GUI::I18N::translate((s))
-
 namespace GUI
 {
 class Tab;