WIP: Moved sources int src/, separated most of the source code from Perl.

The XS was left only for the unit / integration tests, and it links
libslic3r only. No wxWidgets are allowed to be used from Perl starting
from now.

src/slic3r/GUI/Preferences.hpp

@@ -0,0 +1,31 @@
+#ifndef slic3r_Preferences_hpp_
+#define slic3r_Preferences_hpp_
+
+#include "GUI.hpp"
+
+#include <wx/dialog.h>
+#include <map>
+
+namespace Slic3r {
+namespace GUI {
+
+class ConfigOptionsGroup;
+
+class PreferencesDialog : public wxDialog
+{
+	std::map<std::string, std::string>	m_values;
+	std::shared_ptr<ConfigOptionsGroup>	m_optgroup;
+	int		m_event_preferences;
+public:
+	PreferencesDialog(wxWindow* parent, int event_preferences);
+	~PreferencesDialog(){ }
+
+	void	build();
+	void	accept();
+};
+
+} // GUI
+} // Slic3r
+
+
+#endif /* slic3r_Preferences_hpp_ */