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/GUI_App.cpp

@@ -1,6 +1,7 @@
 #include "GUI_App.hpp"
 #include "GUI_ObjectList.hpp"
 #include "GUI_ObjectManipulation.hpp"
+#include "I18N.hpp"
 
 #include <boost/lexical_cast.hpp>
 #include <boost/algorithm/string.hpp>
@@ -13,14 +14,17 @@
 #include <wx/menuitem.h>
 #include <wx/filedlg.h>
 #include <wx/dir.h>
+#include <wx/wupdlock.h>
+
+#include "libslic3r/Utils.hpp"
+#include "libslic3r/Model.hpp"
+#include "libslic3r/I18N.hpp"
 
-#include "Utils.hpp"
 #include "GUI.hpp"
 #include "GUI_Utils.hpp"
 #include "AppConfig.hpp"
 #include "PresetBundle.hpp"
 #include "3DScene.hpp"
-#include "Model.hpp"
 
 #include "../Utils/PresetUpdater.hpp"
 #include "ConfigWizard_private.hpp"
@@ -29,8 +33,6 @@
 #include "FirmwareDialog.hpp"
 #include "Preferences.hpp"
 #include "Tab.hpp"
-#include <I18N.hpp>
-#include <wx/wupdlock.h>
 #include "SysInfoDialog.hpp"
 
 namespace Slic3r {