Update libraries and make it build on windows.

Still gets some warnings because compilers have changed. But should work.

vendor/POCO/XML/include/Poco/SAX/SAXParser.h

@@ -20,13 +20,16 @@
 
 #include "Poco/XML/XML.h"
 #include "Poco/SAX/XMLReader.h"
-#include "Poco/XML/ParserEngine.h"
+#include "Poco/TextEncoding.h"
 
 
 namespace Poco {
 namespace XML {
 
 
+class ParserEngine;
+
+
 class XML_API SAXParser: public XMLReader
 	/// This class provides a SAX2 (Simple API for XML) interface to expat,
 	/// the XML parser toolkit.
@@ -101,7 +104,7 @@ protected:
 	void setupParse();
 
 private:
-	ParserEngine _engine;
+	ParserEngine* _engine;
 	bool _namespaces;
 	bool _namespacePrefixes;
 };