Ported Print::bounding_box(), Print::total_bounding_box(), Print::skirt_flow(), Print:skirt_first_layer_height() to XS

xs/src/libslic3r/SupportMaterial.hpp

@@ -0,0 +1,11 @@
+#ifndef slic3r_SupportMaterial_hpp_
+#define slic3r_SupportMaterial_hpp_
+
+namespace Slic3r {
+
+// how much we extend support around the actual contact area
+#define SUPPORT_MATERIAL_MARGIN 1.5
+
+}
+
+#endif