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/Comment.h

@@ -0,0 +1,58 @@
+//
+// Comment.h
+//
+// Library: XML
+// Package: DOM
+// Module:  DOM
+//
+// Definition of the DOM Comment class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef DOM_Comment_INCLUDED
+#define DOM_Comment_INCLUDED
+
+
+#include "Poco/XML/XML.h"
+#include "Poco/DOM/CharacterData.h"
+#include "Poco/XML/XMLString.h"
+
+
+namespace Poco {
+namespace XML {
+
+
+class XML_API Comment: public CharacterData
+	/// This interface inherits from CharacterData and represents the content of
+	/// a comment, i.e., all the characters between the starting '<!--' and ending
+	/// '-->'. Note that this is the definition of a comment in XML, and, in practice,
+	/// HTML, although some HTML tools may implement the full SGML comment structure.
+{
+public:
+	// Node
+	const XMLString& nodeName() const;
+	unsigned short nodeType() const;
+
+protected:
+	Comment(Document* pOwnerDocument, const XMLString& data);
+	Comment(Document* pOwnerDocument, const Comment& comment);
+	~Comment();
+
+	Node* copyNode(bool deep, Document* pOwnerDocument) const;
+
+private:
+	static const XMLString NODE_NAME;
+	
+	friend class Document;
+};
+
+
+} } // namespace Poco::XML
+
+
+#endif // DOM_Comment_INCLUDED