Replaced CONFESS with throw std::exception in libslic3r, so now

libslic3r should be compilable without Perl.

xs/src/slic3r/GUI/3DScene.cpp

@@ -1687,7 +1687,7 @@ void _3DScene::extrusionentity_to_verts(const ExtrusionEntity *extrusion_entity,
                     if (extrusion_entity_collection != nullptr)
                         extrusionentity_to_verts(*extrusion_entity_collection, print_z, copy, volume);
                     else {
-                        CONFESS("Unexpected extrusion_entity type in to_verts()");
+                        throw std::runtime_error("Unexpected extrusion_entity type in to_verts()");
                     }
                 }
             }

xs/src/slic3r/GUI/BackgroundSlicingProcess.cpp

@@ -7,6 +7,7 @@
 
 // Print now includes tbb, and tbb includes Windows. This breaks compilation of wxWidgets if included before wx.
 #include "../../libslic3r/Print.hpp"
+#include "../../libslic3r/Utils.hpp"
 #include "../../libslic3r/GCode/PostProcessor.hpp"
 
 //#undef NDEBUG

xs/src/slic3r/GUI/GLToolbar.hpp

@@ -2,7 +2,7 @@
 #define slic3r_GLToolbar_hpp_
 
 #include "../../slic3r/GUI/GLTexture.hpp"
-#include "../../libslic3r/Utils.hpp"
+#include "../../callback.hpp"
 
 #include <string>
 #include <vector>

xs/src/slic3r/GUI/GUI.hpp

@@ -4,7 +4,7 @@
 #include <string>
 #include <vector>
 #include "PrintConfig.hpp"
-#include "../../libslic3r/Utils.hpp"
+#include "../../callback.hpp"
 #include "GUI_ObjectParts.hpp"
 
 #include <wx/intl.h>

xs/src/slic3r/GUI/ProgressStatusBar.hpp

@@ -4,7 +4,7 @@
 #include <memory>
 #include <functional>
 
-#include "../../libslic3r/Utils.hpp"
+#include "../../callback.hpp"
 
 class wxTimer;
 class wxGauge;