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/ScopedUnlock.h

@@ -0,0 +1,64 @@
+//
+// ScopedUnlock.h
+//
+// Library: Foundation
+// Package: Threading
+// Module:  Mutex
+//
+// Definition of the ScopedUnlock template class.
+//
+// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_ScopedUnlock_INCLUDED
+#define Foundation_ScopedUnlock_INCLUDED
+
+
+#include "Poco/Foundation.h"
+
+
+namespace Poco {
+
+
+template <class M>
+class ScopedUnlock
+	/// A class that simplifies thread synchronization
+	/// with a mutex.
+	/// The constructor accepts a Mutex and unlocks it.
+	/// The destructor locks the mutex.
+{
+public:
+	inline ScopedUnlock(M& mutex, bool unlockNow = true): _mutex(mutex)
+	{
+		if (unlockNow)
+			_mutex.unlock();
+	}
+	inline ~ScopedUnlock()
+	{
+		try
+		{
+			_mutex.lock();
+		}
+		catch (...)
+		{
+			poco_unexpected();
+		}
+	}
+
+private:
+	M& _mutex;
+
+	ScopedUnlock();
+	ScopedUnlock(const ScopedUnlock&);
+	ScopedUnlock& operator = (const ScopedUnlock&);
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_ScopedUnlock_INCLUDED