Removed the GCodePreviewData from the Print class, it does not belong here,

as the GCode is generated outside of the Print class.
Exported the GCodePreviewData as GCode::PreviewData to Perl.
When exporting the G-code with a command line Slic3r,
the GCodeAnalyzer is now supressed for performance reasons.
Removed obsolete Perl module Slic3r::GUI::Plater::3DToolpaths.

xs/xsp/typemap.xspt

@@ -155,6 +155,9 @@
 %typemap{Ref<GCode>}{simple};
 %typemap{Clone<GCode>}{simple};
 
+%typemap{GCodePreviewData*};
+%typemap{Ref<GCodePreviewData>}{simple};
+%typemap{Clone<GCodePreviewData>}{simple};
 
 %typemap{Points};
 %typemap{Pointfs};