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/Foundation/include/Poco/Notification.h

@@ -0,0 +1,55 @@
+//
+// Notification.h
+//
+// Library: Foundation
+// Package: Notifications
+// Module:  Notification
+//
+// Definition of the Notification class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_Notification_INCLUDED
+#define Foundation_Notification_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/Mutex.h"
+#include "Poco/RefCountedObject.h"
+#include "Poco/AutoPtr.h"
+
+
+namespace Poco {
+
+
+class Foundation_API Notification: public RefCountedObject
+	/// The base class for all notification classes used
+	/// with the NotificationCenter and the NotificationQueue
+	/// classes.
+	/// The Notification class can be used with the AutoPtr
+	/// template class.
+{
+public:
+	using Ptr = AutoPtr<Notification>;
+	
+	Notification();
+		/// Creates the notification.
+
+	virtual std::string name() const;
+		/// Returns the name of the notification.
+		/// The default implementation returns the class name.
+
+protected:
+	virtual ~Notification();
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_Notification_INCLUDED