Major plugin refactor and cleanup.

Switched to POCO library for unified platform/library interface.
Deprecated the external module API. It was creating more problems than solving.
Removed most built-in libraries in favor of system libraries for easier maintenance.
Cleaned and secured code with help from static analyzers.

vendor/POCO/XML/samples/SAXParser/src/SAXParser.cpp

@@ -0,0 +1,193 @@
+//
+// SAXParser.cpp
+//
+// This sample demonstrates the SAXParser class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#include "Poco/SAX/SAXParser.h"
+#include "Poco/SAX/ContentHandler.h"
+#include "Poco/SAX/LexicalHandler.h"
+#include "Poco/SAX/Attributes.h"
+#include "Poco/SAX/Locator.h"
+#include "Poco/Exception.h"
+#include <iostream>
+
+
+using Poco::XML::SAXParser;
+using Poco::XML::XMLReader;
+using Poco::XML::XMLString;
+using Poco::XML::XMLChar;
+using Poco::XML::ContentHandler;
+using Poco::XML::LexicalHandler;
+using Poco::XML::Attributes;
+using Poco::XML::Locator;
+
+
+class MyHandler: public ContentHandler, public LexicalHandler
+{
+public:
+	MyHandler():
+		_pLocator(0)
+	{
+	}
+	
+	// ContentHandler
+	void setDocumentLocator(const Locator* loc)
+	{
+		_pLocator = loc;
+	}
+	
+	void startDocument()
+	{
+		where("startDocument");
+	}
+	
+	void endDocument()
+	{
+		where("endDocument");
+	}
+	
+	void startElement(const XMLString& uri, const XMLString& localName, const XMLString& qname, const Attributes& attributes)
+	{
+		where("startElement");
+		std::cout << "uri:       " << uri << std::endl
+		          << "localName: " << localName << std::endl
+		          << "qname:     " << qname << std::endl;
+		std::cout << "Attributes: " << std::endl;
+		for (int i = 0; i < attributes.getLength(); ++i)
+		{
+			std::cout << attributes.getLocalName(i) << "=" << attributes.getValue(i) << std::endl;
+		}
+	}
+	
+	void endElement(const XMLString& uri, const XMLString& localName, const XMLString& qname)
+	{
+		where("endElement");
+	}
+	
+	void characters(const XMLChar ch[], int start, int length)
+	{
+		where("characters");
+		std::cout << std::string(ch + start, length) << std::endl;
+	}
+	
+	void ignorableWhitespace(const XMLChar ch[], int start, int length)
+	{
+		where("ignorableWhitespace");
+	}
+	
+	void processingInstruction(const XMLString& target, const XMLString& data)
+	{
+		where("processingInstruction");
+		std::cout << "target=" << target << ", data=" << data << std::endl;
+	}
+	
+	void startPrefixMapping(const XMLString& prefix, const XMLString& uri)
+	{
+		where("startPrefixMapping");
+		std::cout << "prefix=" << prefix << " uri=" << uri << std::endl;
+	}
+	
+	void endPrefixMapping(const XMLString& prefix)
+	{
+		where("endPrefixMapping");
+		std::cout << "prefix=" << prefix << std::endl;
+	}
+	
+	void skippedEntity(const XMLString& name)
+	{
+		where("skippedEntity");
+		std::cout << "name=" << name << std::endl;
+	}
+	
+	// LexicalHandler
+	void startDTD(const XMLString& name, const XMLString& publicId, const XMLString& systemId)
+	{
+		where("startDTD");
+	}
+	
+	void endDTD()
+	{
+		where("endDTD");
+	}
+	
+	void startEntity(const XMLString& name)
+	{
+		where("startEntity");
+	}
+	
+	void endEntity(const XMLString& name)
+	{
+		where("endEntity");
+	}
+	
+	void startCDATA()
+	{
+		where("startCDATA");
+	}
+	
+	void endCDATA()
+	{
+		where("endCDATA");
+	}
+	
+	void comment(const XMLChar ch[], int start, int length)
+	{
+		where("comment");
+	}
+	
+protected:
+	void where(const std::string& meth)
+	{
+		std::cout << "*** " << meth;
+		if (_pLocator)
+		{
+			std::cout << " in "
+			          << _pLocator->getSystemId()
+			          << ", line " << _pLocator->getLineNumber() 
+			          << ", col " << _pLocator->getColumnNumber() 
+			          << std::endl;
+		}
+	}
+	
+private:
+	const Locator* _pLocator;
+};
+
+
+int main(int argc, char** argv)
+{
+	// parse an XML document and print the generated SAX events
+
+	if (argc < 2)
+	{
+		std::cout << "usage: " << argv[0] << ": <xmlfile>" << std::endl;
+		return 1;
+	}
+	
+	MyHandler handler;
+
+	SAXParser parser;
+	parser.setFeature(XMLReader::FEATURE_NAMESPACES, true);
+	parser.setFeature(XMLReader::FEATURE_NAMESPACE_PREFIXES, true);
+	parser.setContentHandler(&handler);
+	parser.setProperty(XMLReader::PROPERTY_LEXICAL_HANDLER, static_cast<LexicalHandler*>(&handler));
+	
+	try
+	{
+		parser.parse(argv[1]);
+	}
+	catch (Poco::Exception& e)
+	{
+		std::cerr << e.displayText() << std::endl;
+		return 2;
+	}
+	
+	return 0;
+}