Rewrote Fill2.pm to C++, deleted Perl infills for good.

Removed dependency on Perl Math::PlanePath module.
Fixed compilation with Visual Studio and SLIC3R_DEBUG: Visual Studio older than 2015 does not support the prinf type specifier %zu. Use %Iu instead.
C++11 move semantics enabled.

xs/src/libslic3r/SupportMaterial.hpp

@@ -43,7 +43,8 @@ public:
 			height(0.),
 			idx_object_layer_above(size_t(-1)),
 			idx_object_layer_below(size_t(-1)),
-			bridging(false)
+			bridging(false),
+			aux_polygons(NULL)
 			{}
 
 		~MyLayer()