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/ThreadTarget.h

@@ -0,0 +1,87 @@
+//
+// ThreadTarget.h
+//
+// Library: Foundation
+// Package: Threading
+// Module:  ThreadTarget
+//
+// Definition of the ThreadTarget class.
+//
+// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_ThreadTarget_INCLUDED
+#define Foundation_ThreadTarget_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/Runnable.h"
+
+
+namespace Poco {
+
+
+class Foundation_API ThreadTarget: public Runnable
+	/// This adapter simplifies using static member functions as well as 
+	/// standalone functions as targets for threads.
+	/// Note that it is possible to pass those entities directly to Thread::start().
+	/// This adapter is provided as a convenience for higher abstraction level
+	/// scenarios where Runnable abstract class is used.
+	///
+	/// For using a non-static member function as a thread target, please
+	/// see the RunnableAdapter class.
+	/// 
+	/// Usage:
+	///    class MyObject
+	///    {
+	///        static void doSomething() {}
+	///    };
+	///    ThreadTarget ra(&MyObject::doSomething);
+	///    Thread thr;
+	///    thr.start(ra);
+	///
+	/// or:
+	/// 
+	///    void doSomething() {}
+	/// 
+	///    ThreadTarget ra(doSomething);
+	///    Thread thr;
+	///    thr.start(ra);
+{
+public:
+	typedef void (*Callback)();
+	
+	ThreadTarget(Callback method);
+	
+	ThreadTarget(const ThreadTarget& te);
+
+	~ThreadTarget();
+
+	ThreadTarget& operator = (const ThreadTarget& te);
+
+	void run();
+	
+private:
+	ThreadTarget();
+
+	Callback _method;
+};
+
+
+//
+// inlines
+//
+inline void ThreadTarget::run()
+{
+	_method();
+}
+
+
+} // namespace Poco
+
+
+#endif // Foundation_ThreadTarget_INCLUDED