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/NodeAppender.h

@@ -0,0 +1,81 @@
+//
+// NodeAppender.h
+//
+// Library: XML
+// Package: DOM
+// Module:  NodeAppender
+//
+// Definition of the NodeAppender class.
+//
+// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef DOM_NodeAppender_INCLUDED
+#define DOM_NodeAppender_INCLUDED
+
+
+#include "Poco/XML/XML.h"
+#include "Poco/DOM/Node.h"
+
+
+namespace Poco {
+namespace XML {
+
+
+class AbstractNode;
+class Element;
+
+
+class XML_API NodeAppender
+	/// The NodeAppender class provides a very fast way to
+	/// build larger DOM documents.
+	///
+	/// In the DOM, child nodes are usually appended to a parent
+	/// node using the appendChild() method. For nodes containing
+	/// more than a few children, this method can be quite slow,
+	/// due to the way it's implemented, and because of the 
+	/// requirements of the DOM specification.
+	///
+	/// While the NodeAppender is being used on an Element, no
+	/// children-modifying methods of that Element must be used.
+	///
+	/// This class is not part of the DOM specification.
+{
+public:
+	NodeAppender(Element* parent);
+		/// Creates the NodeAppender for the given parent node,
+		/// which must be an Element.
+
+	~NodeAppender();
+		/// Destroys the NodeAppender.
+
+	void appendChild(Node* newChild);
+		/// Appends the node newChild to the end of the list of children of
+		/// the parent node specified in the constructor.
+		/// If the newChild is already in the tree, it is first removed.
+		///
+		/// NewChild can be a DocumentFragment. In this case, all children
+		/// of the fragment become children of the parent element.
+		///
+		/// In order to speed up the function, no DOM events
+		/// are fired.
+
+private:
+	NodeAppender();
+	NodeAppender(const NodeAppender&);
+	NodeAppender& operator = (const NodeAppender&);
+	
+	Element*      _pParent;
+	AbstractNode* _pLast;
+};
+
+
+} } // namespace Poco::XML
+
+
+#endif // #include "Poco/XML/XML.h"
+