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/include/Poco/DOM/DOMParser.h

@@ -0,0 +1,114 @@
+//
+// DOMParser.h
+//
+// Library: XML
+// Package: DOM
+// Module:  DOMParser
+//
+// Definition of the DOMParser class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef DOM_DOMParser_INCLUDED
+#define DOM_DOMParser_INCLUDED
+
+
+#include "Poco/XML/XML.h"
+#include "Poco/SAX/SAXParser.h"
+
+
+namespace Poco {
+namespace XML {
+
+
+class NamePool;
+class Document;
+class InputSource;
+class EntityResolver;
+
+
+class XML_API DOMParser
+	/// This is a convenience class that combines a
+	/// DOMBuilder with a SAXParser, with the optional
+	/// support of a WhitespaceFilter.
+{
+public:
+	explicit DOMParser(NamePool* pNamePool = 0);
+		/// Creates a new DOMParser. 
+		/// If a NamePool is given, it becomes the Document's NamePool.
+		
+	explicit DOMParser(unsigned long namePoolSize);
+		/// Creates a new DOMParser, using the given NamePool size.
+		///
+		/// The given namePoolSize should be a suitable prime number, 
+		/// e.g. 251, 509, 1021 or 4093, depending on the expected
+		/// size of the document.
+
+	~DOMParser();
+		/// Destroys the DOMParser.
+
+	void setEncoding(const XMLString& encoding);
+		/// Sets the encoding used by the parser if no
+		/// encoding is specified in the XML document.
+		
+	const XMLString& getEncoding() const;
+		/// Returns the name of the encoding used by
+		/// the parser if no encoding is specified in
+		/// the XML document.
+
+	void addEncoding(const XMLString& name, Poco::TextEncoding* pEncoding);
+		/// Adds an encoding to the parser.
+
+	void setFeature(const XMLString& name, bool state);
+		/// Set the state of a feature.
+		///
+		/// If a feature is not recognized by the DOMParser, it is
+		/// passed on to the underlying XMLReader.
+		///
+		/// The only currently supported feature is
+		/// http://www.appinf.com/features/no-whitespace-in-element-content
+		/// which, when activated, causes the WhitespaceFilter to
+		/// be used.
+
+	bool getFeature(const XMLString& name) const;
+		/// Look up the value of a feature.
+		///
+		/// If a feature is not recognized by the DOMParser, the
+		/// DOMParser queries the underlying SAXParser for the feature.
+
+	Document* parse(const XMLString& uri);
+		/// Parse an XML document from a location identified by an URI.
+
+	Document* parse(InputSource* pInputSource);
+		/// Parse an XML document from a location identified by an InputSource.
+
+	Document* parseString(const std::string& xml);
+		/// Parse an XML document from a string.
+
+	Document* parseMemory(const char* xml, std::size_t size);
+		/// Parse an XML document from memory.
+
+	EntityResolver* getEntityResolver() const;
+		/// Returns the entity resolver used by the underlying SAXParser.
+
+	void setEntityResolver(EntityResolver* pEntityResolver);
+		/// Sets the entity resolver on the underlying SAXParser.
+
+	static const XMLString FEATURE_FILTER_WHITESPACE;
+	
+private:
+	SAXParser _saxParser;
+	NamePool* _pNamePool;
+	bool      _filterWhitespace;
+};
+
+
+} } // namespace Poco::XML
+
+
+#endif // DOM_DOMParser_INCLUDED