Ported the G-code generator from Perl to C++.

Removed GCode.pm
Removed the Perl bindigns for AvoidCrossingPerimeters, OozePrevention, SpiralVase, Wipe
Changed the std::set of extruder IDs to vector of IDs.
Removed some MSVC compiler warnings, removed obnoxious compiler warnings when compiling the Perl bindings.

xs/src/libslic3r/SurfaceCollection.hpp

@@ -9,7 +9,7 @@ namespace Slic3r {
 
 class SurfaceCollection
 {
-    public:
+public:
     Surfaces surfaces;
     
     SurfaceCollection() {};