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/ProcessingInstruction.h

@@ -0,0 +1,99 @@
+//
+// ProcessingInstruction.h
+//
+// Library: XML
+// Package: DOM
+// Module:  DOM
+//
+// Definition of the DOM ProcessingInstruction class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef DOM_ProcessingInstruction_INCLUDED
+#define DOM_ProcessingInstruction_INCLUDED
+
+
+#include "Poco/XML/XML.h"
+#include "Poco/DOM/AbstractNode.h"
+#include "Poco/XML/XMLString.h"
+
+
+namespace Poco {
+namespace XML {
+
+
+class XML_API ProcessingInstruction: public AbstractNode
+	/// The ProcessingInstruction interface represents a "processing instruction",
+	/// used in XML as a way to keep processor-specific information in the text
+	/// of the document.
+{
+public:
+	const XMLString& target() const;
+		/// Returns the target of this processing instruction.
+		/// XML defines this as being the first token following
+		/// the markup that begins the processing instruction.
+
+	const XMLString& data() const;
+		/// Returns the content of this processing instruction. This is from the first non 
+		/// white space character after the target to the character immediately preceding
+		/// the ?>.
+
+	const XMLString& getData() const;
+		/// Returns the content of this processing instruction. This is from the first non 
+		/// white space character after the target to the character immediately preceding
+		/// the ?>.
+
+	void setData(const XMLString& data);
+		/// Sets the content of this processing instruction.
+
+	// Node
+	const XMLString& nodeName() const;
+	const XMLString& getNodeValue() const;
+	void setNodeValue(const XMLString& data);
+	unsigned short nodeType() const;
+
+protected:
+	ProcessingInstruction(Document* pOwnerDocument, const XMLString& target, const XMLString& data);
+	ProcessingInstruction(Document* pOwnerDocument, const ProcessingInstruction& processingInstruction);
+	~ProcessingInstruction();
+
+	Node* copyNode(bool deep, Document* pOwnerDocument) const;
+
+private:
+	XMLString _target;
+	XMLString _data;
+	
+	friend class Document;
+};
+
+
+//
+// inlines
+//
+inline const XMLString& ProcessingInstruction::target() const
+{
+	return _target;
+}
+
+
+inline const XMLString& ProcessingInstruction::data() const
+{
+	return _data;
+}
+
+
+inline const XMLString& ProcessingInstruction::getData() const
+{
+	return _data;
+}
+
+
+} } // namespace Poco::XML
+
+
+#endif // DOM_ProcessingInstruction_INCLUDED