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/EventDispatcher.h

@@ -0,0 +1,97 @@
+//
+// EventDispatcher.h
+//
+// Library: XML
+// Package: DOM
+// Module:  DOMEvents
+//
+// Definition of the EventDispatcher class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef DOM_EventDispatcher_INCLUDED
+#define DOM_EventDispatcher_INCLUDED
+
+
+#include "Poco/XML/XML.h"
+#include "Poco/XML/XMLString.h"
+#include <list>
+
+
+namespace Poco {
+namespace XML {
+
+
+class Event;
+class EventListener;
+
+
+class XML_API EventDispatcher
+	/// This helper class manages event listener subscriptions
+	/// and event dispatching for AbstractNode.
+	///
+	/// The EventListener list is managed in such a way that
+	/// event listeners can be added and removed even
+	/// from within an EventListener, while events are being
+	/// dispatched.
+{
+public:
+	EventDispatcher();
+		/// Creates the EventDispatcher.
+		
+	~EventDispatcher();
+		/// Destroys the EventDispatcher.
+		
+	void addEventListener(const XMLString& type, EventListener* listener, bool useCapture);
+		/// Adds an EventListener to the internal list.
+		
+	void removeEventListener(const XMLString& type, EventListener* listener, bool useCapture);
+		/// Removes an EventListener from the internal list.
+		///
+		/// If a dispatch is currently in progress, the list
+		/// entry is only marked for deletion.
+		/// If no dispatch is currently in progress, all EventListeners
+		/// marked for deletion are removed from the list.
+
+	void dispatchEvent(Event* evt);
+		/// Dispatches the event.
+		///
+		/// Also removes all EventListeners marked for deletion from the 
+		/// event dispatcher list.
+		
+	void captureEvent(Event* evt);
+		/// Dispatches the event in its capturing phase.
+		///
+		/// Also removes all EventListeners marked for deletion from the 
+		/// event dispatcher list.
+		
+	void bubbleEvent(Event* evt);
+		/// Dispatches the event in its bubbling phase.
+		///
+		/// Also removes all EventListeners marked for deletion from the 
+		/// event dispatcher list.
+
+private:
+	struct EventListenerItem
+	{
+		XMLString      type;
+		EventListener* pListener;
+		bool           useCapture;
+	};
+
+	typedef std::list<EventListenerItem> EventListenerList;
+	
+	int               _inDispatch;
+	EventListenerList _listeners;
+};
+
+
+} } // namespace Poco::XML
+
+
+#endif // DOM_EventDispatcher_INCLUDED