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/EventTarget.h

@@ -0,0 +1,76 @@
+//
+// EventTarget.h
+//
+// Library: XML
+// Package: DOM
+// Module:  DOMEvents
+//
+// Definition of the DOM EventTarget interface.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef DOM_EventTarget_INCLUDED
+#define DOM_EventTarget_INCLUDED
+
+
+#include "Poco/XML/XML.h"
+#include "Poco/DOM/DOMObject.h"
+#include "Poco/XML/XMLString.h"
+
+
+namespace Poco {
+namespace XML {
+
+
+class EventListener;
+class Event;
+
+
+class XML_API EventTarget: public DOMObject
+	/// The EventTarget interface is implemented by all Nodes in an implementation
+	/// which supports the DOM Event Model. Therefore, this interface can be obtained
+	/// by using binding-specific casting methods on an instance of the Node interface.
+	/// The interface allows registration and removal of EventListeners on an EventTarget
+	/// and dispatch of events to that EventTarget.
+{
+public:
+	virtual void addEventListener(const XMLString& type, EventListener* listener, bool useCapture) = 0;
+		/// This method allows the registration of event listeners on 
+		/// the event target. If an EventListener is added to an
+		/// EventTarget while it is processing an event, it will not 
+		/// be triggered by the current actions but may be triggered
+		/// during a later stage of event flow, such as the bubbling phase.
+		/// If multiple identical EventListeners are registered on the same 
+		/// EventTarget with the same parameters the duplicate instances are 
+		/// discarded. They do not cause the EventListener to be called twice and since they are
+		/// discarded they do not need to be removed with the removeEventListener method. 	
+	
+	virtual void removeEventListener(const XMLString& type, EventListener* listener, bool useCapture) = 0;
+		/// This method allows the removal of event listeners from the event 
+		/// target. If an EventListener is removed from an EventTarget while it is 
+		/// processing an event, it will not be triggered by the current actions. 
+		/// EventListeners can never be invoked after being removed.
+		/// Calling removeEventListener with arguments which do not identify 
+		/// any currently registered EventListener on the EventTarget has no effect. 
+
+	virtual bool dispatchEvent(Event* evt) = 0;
+		/// This method allows the dispatch of events into the implementations 
+		/// event model. Events dispatched in this manner will have the same capturing and 
+		/// bubbling behavior as events dispatched directly by the
+		/// implementation. The target of the event is the EventTarget on 
+		/// which dispatchEvent is called. 
+
+protected:
+	virtual ~EventTarget();
+};
+
+
+} } // namespace Poco::XML
+
+
+#endif // DOM_EventTarget_INCLUDED