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/Entity.h

@@ -0,0 +1,126 @@
+//
+// Entity.h
+//
+// Library: XML
+// Package: DOM
+// Module:  DOM
+//
+// Definition of the DOM Entity class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef DOM_Entity_INCLUDED
+#define DOM_Entity_INCLUDED
+
+
+#include "Poco/XML/XML.h"
+#include "Poco/DOM/AbstractContainerNode.h"
+#include "Poco/XML/XMLString.h"
+
+
+namespace Poco {
+namespace XML {
+
+
+class XML_API Entity: public AbstractContainerNode
+	/// This interface represents an entity, either parsed or unparsed, in an XML
+	/// document. Note that this models the entity itself not the entity declaration.
+	/// Entity declaration modeling has been left for a later Level of the DOM
+	/// specification.
+	/// 
+	/// The nodeName attribute that is inherited from Node contains the name of
+	/// the entity.
+	/// 
+	/// An XML processor may choose to completely expand entities before the structure
+	/// model is passed to the DOM; in this case there will be no EntityReference
+	/// nodes in the document tree.
+	/// 
+	/// XML does not mandate that a non-validating XML processor read and process
+	/// entity declarations made in the external subset or declared in external
+	/// parameter entities. This means that parsed entities declared in the external
+	/// subset need not be expanded by some classes of applications, and that the
+	/// replacement value of the entity may not be available. When the replacement
+	/// value is available, the corresponding Entity node's child list represents
+	/// the structure of that replacement text. Otherwise, the child list is empty.
+	/// 
+	/// The resolution of the children of the Entity (the replacement value) may
+	/// be lazily evaluated; actions by the user (such as calling the childNodes
+	/// method on the Entity Node) are assumed to trigger the evaluation.
+	/// 
+	/// The DOM Level 1 does not support editing Entity nodes; if a user wants to
+	/// make changes to the contents of an Entity, every related EntityReference
+	/// node has to be replaced in the structure model by a clone of the Entity's
+	/// contents, and then the desired changes must be made to each of those clones
+	/// instead. Entity nodes and all their descendants are readonly.
+	/// 
+	/// An Entity node does not have any parent.
+{
+public:
+	const XMLString& publicId() const;
+		/// Returns the public identifier associated with
+		/// the entity, if specified. If the public identifier
+		/// was not specified, this is the empty string.
+
+	const XMLString& systemId() const;
+		/// Returns the system identifier associated with
+		/// the entity, if specified. If the system identifier
+		/// was not specified, this is the empty string.
+
+	const XMLString& notationName() const;
+		/// Returns, for unparsed entities, the name of the
+		/// notation for the entity. For parsed entities, this
+		/// is the empty string.
+
+	// Node
+	const XMLString& nodeName() const;
+	unsigned short nodeType() const;
+
+protected:
+	Entity(Document* pOwnerDocument, const XMLString& name, const XMLString& publicId, const XMLString& systemId, const XMLString& notationName);
+	Entity(Document* pOwnerDocument, const Entity& entity);
+	~Entity();
+	
+	Node* copyNode(bool deep, Document* pOwnerDocument) const;
+
+private:
+	static const XMLString NODE_NAME;
+
+	XMLString _name;
+	XMLString _publicId;
+	XMLString _systemId;
+	XMLString _notationName;
+
+	friend class Document;
+};
+
+
+//
+// inlines
+//
+inline const XMLString& Entity::publicId() const
+{
+	return _publicId;
+}
+
+
+inline const XMLString& Entity::systemId() const
+{
+	return _systemId;
+}
+
+
+inline const XMLString& Entity::notationName() const
+{
+	return _notationName;
+}
+
+
+} } // namespace Poco::XML
+
+
+#endif // DOM_Entity_INCLUDED