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/libnest2d/tests/printer_parts.h

@@ -0,0 +1,40 @@
+#ifndef PRINTER_PARTS_H
+#define PRINTER_PARTS_H
+
+#include <vector>
+#include <clipper.hpp>
+
+#ifndef CLIPPER_BACKEND_HPP
+namespace ClipperLib {
+using PointImpl = IntPoint;
+using PathImpl = Path;
+using HoleStore = std::vector<PathImpl>;
+
+struct PolygonImpl {
+    PathImpl Contour;
+    HoleStore Holes;
+
+    inline PolygonImpl() {}
+
+    inline explicit PolygonImpl(const PathImpl& cont): Contour(cont) {}
+    inline explicit PolygonImpl(const HoleStore& holes):
+        Holes(holes) {}
+    inline PolygonImpl(const Path& cont, const HoleStore& holes):
+        Contour(cont), Holes(holes) {}
+
+    inline explicit PolygonImpl(PathImpl&& cont): Contour(std::move(cont)) {}
+    inline explicit PolygonImpl(HoleStore&& holes): Holes(std::move(holes)) {}
+    inline PolygonImpl(Path&& cont, HoleStore&& holes):
+        Contour(std::move(cont)), Holes(std::move(holes)) {}
+};
+}
+#endif
+
+using TestData = std::vector<ClipperLib::Path>;
+using TestDataEx = std::vector<ClipperLib::PolygonImpl>;
+
+extern const TestData PRINTER_PART_POLYGONS;
+extern const TestData STEGOSAUR_POLYGONS;
+extern const TestDataEx PRINTER_PART_POLYGONS_EX;
+
+#endif // PRINTER_PARTS_H