Removed some obsolete Perl bindings.

Removed libslic3r from the default include paths for all modules but
libslic3r. Now headers from libslic3r need to be included with an
explicit path (libslic3r/libslic3r.h etc)
Split the localization macros into I18N.{cpp,h}

src/slic3r/GUI/SysInfoDialog.cpp

@@ -1,13 +1,11 @@
 #include "SysInfoDialog.hpp"
-// #include "AboutDialog.hpp"
+#include "I18N.hpp"
+#include "3DScene.hpp"
+#include "GUI.hpp"
 
 #include <wx/clipbrd.h>
 #include <wx/platinfo.h>
 
-// #include "../../libslic3r/Utils.hpp"
-#include "3DScene.hpp"
-#include "GUI.hpp"
-
 namespace Slic3r { 
 namespace GUI {