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/NodeIterator.h

@@ -0,0 +1,167 @@
+//
+// NodeIterator.h
+//
+// Library: XML
+// Package: DOM
+// Module:  NodeIterator
+//
+// Definition of the DOM NodeIterator class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef DOM_NodeIterator_INCLUDED
+#define DOM_NodeIterator_INCLUDED
+
+
+#include "Poco/XML/XML.h"
+
+
+namespace Poco {
+namespace XML {
+
+
+class Node;
+class NodeFilter;
+
+
+class XML_API NodeIterator
+	/// Iterators are used to step through a set of nodes, e.g. the set of nodes
+	/// in a NodeList, the document subtree governed by a particular Node, the results
+	/// of a query, or any other set of nodes. The set of nodes to be iterated is
+	/// determined by the implementation of the NodeIterator. DOM Level 2 specifies
+	/// a single NodeIterator implementation for document-order traversal of a document
+	/// subtree.
+	///
+	/// A NodeIterator can be directly instantiated using one of its constructors -
+	/// the DocumentTraversal interface is not needed and therefore not implemented.
+	/// Unlike most other DOM classes, NodeIterator supports value semantics.
+	///
+	/// If the NodeIterator's current node is removed from the document, the
+	/// result of calling any of the movement methods is undefined. This behavior does
+	/// not conform to the DOM Level 2 Traversal specification.
+{
+public:
+	NodeIterator(Node* root, unsigned long whatToShow, NodeFilter* pFilter = 0);
+		/// Creates a NodeIterator over the subtree rooted at the specified node.
+		
+	NodeIterator(const NodeIterator& iterator);
+		/// Creates a NodeIterator by copying another NodeIterator.
+		
+	NodeIterator& operator = (const NodeIterator& iterator);
+		/// Assignment operator.
+		
+	~NodeIterator();
+		/// Destroys the NodeIterator.
+
+	Node* root() const;
+		/// The root node of the NodeIterator, as specified when it was created.
+
+	unsigned long whatToShow() const;
+		/// This attribute determines which node types are presented via the iterator. 
+		/// The available set of constants is defined in the NodeFilter interface. 
+		/// Nodes not accepted by whatToShow will be skipped, but their children may 
+		/// still be considered. Note that this skip takes precedence over the filter, 
+		/// if any.
+
+	NodeFilter* filter() const;
+		/// The NodeFilter used to screen nodes.
+
+	bool expandEntityReferences() const;
+		/// The value of this flag determines whether the children of entity reference
+		/// nodes are visible to the iterator. If false, they and their descendants
+		/// will be rejected. Note that this rejection takes precedence over whatToShow
+		/// and the filter. Also note that this is currently the only situation where
+		/// NodeIterators may reject a complete subtree rather than skipping individual
+		/// nodes.
+		/// 
+		/// To produce a view of the document that has entity references expanded and
+		/// does not expose the entity reference node itself, use the whatToShow flags
+		/// to hide the entity reference node and set expandEntityReferences to true
+		/// when creating the iterator. To produce a view of the document that has entity
+		/// reference nodes but no entity expansion, use the whatToShow flags to show
+		/// the entity reference node and set expandEntityReferences to false.
+		///
+		/// This implementation does not support entity reference expansion and
+		/// thus always returns false.
+
+	Node* nextNode();
+		/// Returns the next node in the set and advances the position of the iterator
+		/// in the set. After a NodeIterator is created, the first call to nextNode()
+		/// returns the first node in the set.
+
+	Node* previousNode();
+		/// Returns the previous node in the set and moves the position of the NodeIterator
+		/// backwards in the set.
+
+	Node* currentNodeNP() const;
+		/// Returns the current node in the set.
+		///
+		/// Leaves the NodeIterator unchanged.
+		///
+		/// Warning: This is a proprietary extension to the DOM Level 2 NodeIterator
+		/// interface.
+
+	void detach();
+		/// Detaches the NodeIterator from the set which it iterated over, releasing
+		/// any computational resources and placing the iterator in the INVALID state.
+		/// After detach has been invoked, calls to nextNode or previousNode will raise
+		/// the exception INVALID_STATE_ERR.
+
+protected:
+	bool accept(Node* pNode) const;
+	Node* next() const;
+	Node* previous() const;
+	Node* last();
+
+private:
+	NodeIterator();
+	
+	Node*         _pRoot;
+	unsigned long _whatToShow;
+	NodeFilter*   _pFilter;
+	Node*         _pCurrent;
+};
+
+
+//
+// inlines
+//
+inline Node* NodeIterator::root() const
+{
+	return _pRoot;
+}
+
+
+inline Node* NodeIterator::currentNodeNP() const
+{
+	return _pCurrent;
+}
+
+
+inline unsigned long NodeIterator::whatToShow() const
+{
+	return _whatToShow;
+}
+
+
+inline NodeFilter* NodeIterator::filter() const
+{
+	return _pFilter;
+}
+
+
+inline bool NodeIterator::expandEntityReferences() const
+{
+	return false;
+}
+
+
+} } // namespace Poco::XML
+
+
+#endif // DOM_NodeIterator_INCLUDED