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/2DBed.cpp

@@ -1,9 +1,10 @@
 #include "2DBed.hpp"
 
 #include <wx/dcbuffer.h>
-#include "BoundingBox.hpp"
-#include "Geometry.hpp"
-#include "ClipperUtils.hpp"
+
+#include "libslic3r/BoundingBox.hpp"
+#include "libslic3r/Geometry.hpp"
+#include "libslic3r/ClipperUtils.hpp"
 
 namespace Slic3r {
 namespace GUI {