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/Format/AMF.cpp

@@ -147,6 +147,9 @@ struct AMFParserContext
     Instance                *m_instance;
     // Generic string buffer for vertices, face indices, metadata etc.
     std::string              m_value[3];
+
+private:
+    AMFParserContext& operator=(AMFParserContext&);
 };
 
 void AMFParserContext::startElement(const char *name, const char **atts)
@@ -307,7 +310,7 @@ void AMFParserContext::characters(const XML_Char *s, int len)
     }
 }
 
-void AMFParserContext::endElement(const char *name)
+void AMFParserContext::endElement(const char * /* name */)
 {
     switch (m_path.back()) {