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/wxinit.h

@@ -0,0 +1,25 @@
+#ifndef slic3r_wxinit_hpp_
+#define slic3r_wxinit_hpp_
+
+#include <wx/wx.h>
+#include <wx/intl.h>
+#include <wx/html/htmlwin.h>
+
+// Perl redefines a _ macro, so we undef this one
+#undef _
+
+// We do want to use translation however, so define it as __ so we can do a find/replace
+// later when we no longer need to undef _
+#define __(s)                     wxGetTranslation((s))
+
+// legacy macros
+// https://wiki.wxwidgets.org/EventTypes_and_Event-Table_Macros
+#ifndef wxEVT_BUTTON
+#define wxEVT_BUTTON wxEVT_COMMAND_BUTTON_CLICKED
+#endif
+
+#ifndef wxEVT_HTML_LINK_CLICKED
+#define wxEVT_HTML_LINK_CLICKED wxEVT_COMMAND_HTML_LINK_CLICKED
+#endif
+
+#endif