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/TaskNotification.h

@@ -0,0 +1,170 @@
+//
+// TaskNotification.h
+//
+// Library: Foundation
+// Package: Tasks
+// Module:  Tasks
+//
+// Definition of the TaskNotification class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_TaskNotification_INCLUDED
+#define Foundation_TaskNotification_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/Notification.h"
+#include "Poco/Task.h"
+
+
+namespace Poco {
+
+
+class Foundation_API TaskNotification: public Notification
+	/// Base class for TaskManager notifications.
+{
+public:
+	TaskNotification(Task* pTask);
+		/// Creates the TaskNotification.
+
+	Task* task() const;
+		/// Returns the subject of the notification.
+
+protected:
+	virtual ~TaskNotification();
+		/// Destroys the TaskNotification.
+
+private:
+	Task* _pTask;
+};
+
+
+class Foundation_API TaskStartedNotification: public TaskNotification
+	/// This notification is posted by the TaskManager for
+	/// every task that has been started.
+{
+public:
+	TaskStartedNotification(Task* pTask);
+	
+protected:
+	~TaskStartedNotification();
+};
+
+
+class Foundation_API TaskCancelledNotification: public TaskNotification
+	/// This notification is posted by the TaskManager for
+	/// every task that has been cancelled.
+{
+public:
+	TaskCancelledNotification(Task* pTask);
+
+protected:
+	~TaskCancelledNotification();
+};
+
+
+class Foundation_API TaskFinishedNotification: public TaskNotification
+	/// This notification is posted by the TaskManager for
+	/// every task that has finished.
+{
+public:
+	TaskFinishedNotification(Task* pTask);
+
+protected:
+	~TaskFinishedNotification();
+};
+
+
+class Foundation_API TaskFailedNotification: public TaskNotification
+	/// This notification is posted by the TaskManager for
+	/// every task that has failed with an exception.
+{
+public:
+	TaskFailedNotification(Task* pTask, const Exception& exc);
+
+	const Exception& reason() const;
+
+protected:
+	~TaskFailedNotification();
+	
+private:
+	Exception* _pException;
+};
+
+
+class Foundation_API TaskProgressNotification: public TaskNotification
+	/// This notification is posted by the TaskManager for
+	/// a task when its progress changes.
+{
+public:
+	TaskProgressNotification(Task* pTask, float progress);
+
+	float progress() const;
+
+protected:
+	~TaskProgressNotification();
+	
+private:
+	float _progress;
+};
+
+
+template <class C>
+class TaskCustomNotification: public TaskNotification
+	/// This is a template for "custom" notification.
+	/// Unlike other notifications, this notification
+	/// is instantiated and posted by the task itself.
+	/// The purpose is to provide generic notification
+	/// mechanism between the task and its observer(s).
+{
+public:
+	TaskCustomNotification(Task* pTask, const C& custom):
+		TaskNotification(pTask),
+		_custom(custom)
+	{
+	}
+
+	const C& custom() const
+	{
+		return _custom;
+	}
+
+protected:
+	~TaskCustomNotification(){};
+	
+private:
+	C _custom;
+};
+
+
+//
+// inlines
+//
+inline Task* TaskNotification::task() const
+{
+	return _pTask;
+}
+
+
+inline const Exception& TaskFailedNotification::reason() const
+{
+	return *_pException;
+}
+
+
+inline float TaskProgressNotification::progress() const
+{
+	return _progress;
+}
+
+
+} // namespace Poco
+
+
+#endif // Foundation_TaskNotification_INCLUDED