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/XML/QName.h

@@ -0,0 +1,148 @@
+//
+// QName.h
+//
+// Library: XML
+// Package: XML
+// Module:  QName
+//
+// Definition of the QName class.
+//
+// Copyright (c) 2015, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// Based on libstudxml (http://www.codesynthesis.com/projects/libstudxml/).
+// Copyright (c) 2009-2013 Code Synthesis Tools CC.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef XML_QName_INCLUDED
+#define XML_QName_INCLUDED
+
+
+#include "Poco/XML/XML.h"
+#include <string>
+#include <iosfwd>
+
+
+namespace Poco {
+namespace XML {
+
+
+class XML_API QName
+	/// This class represents a qualified XML name in the stream parser.
+	///
+	/// Note that the optional prefix is just a "syntactic sugar". In
+	/// particular, it is ignored by the comparison operators and the
+	/// std::ostream insertion operator.
+{
+public:
+	QName();
+	QName(const std::string& name);
+	QName(const std::string& ns, const std::string& name);
+	QName(const std::string& ns, const std::string& name, const std::string& prefix);
+	QName(const QName& qname);
+	QName(QName&& qname) noexcept;
+
+	QName& operator = (const QName& qname);
+	QName& operator = (QName&& qname) noexcept;
+	void swap(QName& qname);
+
+	const std::string& namespaceURI() const;
+		/// Returns the namespace URI part of the name.
+
+	const std::string& localName() const;
+		/// Returns the local part of the name.
+
+	const std::string& prefix() const;
+		/// Returns the namespace prefix of the name.
+
+	std::string& namespaceURI();
+		/// Returns the namespace URI part of the name.
+
+	std::string& localName();
+		/// Returns the local part of the name.
+
+	std::string& prefix();
+		/// Returns the namespace prefix of the name.
+
+	std::string toString() const;
+		/// Returns a printable representation in the [<namespace>#]<name> form.
+
+public:
+	friend bool operator < (const QName& x, const QName& y);
+	friend bool operator == (const QName& x, const QName& y);
+	friend bool operator != (const QName& x, const QName& y);
+
+private:
+	std::string _ns;
+	std::string _name;
+	std::string _prefix;
+};
+
+
+//
+// inlines
+//
+inline const std::string& QName::namespaceURI() const
+{
+	return _ns;
+}
+
+
+inline const std::string& QName::localName() const
+{
+	return _name;
+}
+
+
+inline const std::string& QName::prefix() const
+{
+	return _prefix;
+}
+
+
+inline std::string& QName::namespaceURI()
+{
+	return _ns;
+}
+
+
+inline std::string& QName::localName()
+{
+	return _name;
+}
+
+
+inline std::string& QName::prefix()
+{
+	return _prefix;
+}
+
+
+XML_API std::ostream& operator << (std::ostream&, const QName&);
+
+
+inline bool operator < (const QName& x, const QName& y)
+{
+	return x._ns < y._ns || (x._ns == y._ns && x._name < y._name);
+}
+
+
+inline bool operator == (const QName& x, const QName& y)
+{
+	return x._ns == y._ns && x._name == y._name;
+}
+
+
+inline bool operator != (const QName& x, const QName& y)
+{
+	return !(x == y);
+}
+
+
+} } // namespace Poco::XML
+
+
+#endif // XML_QName_INCLUDED