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/RWLock_WIN32.h

@@ -0,0 +1,57 @@
+//
+// RWLock_WIN32.h
+//
+// Library: Foundation
+// Package: Threading
+// Module:  RWLock
+//
+// Definition of the RWLockImpl class for WIN32.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_RWLock_WIN32_INCLUDED
+#define Foundation_RWLock_WIN32_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/Exception.h"
+#include "Poco/UnWindows.h"
+
+
+namespace Poco {
+
+
+class Foundation_API RWLockImpl
+{
+protected:
+	RWLockImpl();
+	~RWLockImpl();
+	void readLockImpl();
+	bool tryReadLockImpl();
+	void writeLockImpl();
+	bool tryWriteLockImpl();
+	void unlockImpl();
+	
+private:
+	void addWriter();
+	void removeWriter();
+	DWORD tryReadLockOnce();
+
+	HANDLE   _mutex;
+	HANDLE   _readEvent;
+	HANDLE   _writeEvent;
+	unsigned _readers;
+	unsigned _writersWaiting;
+	unsigned _writers;
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_RWLock_WIN32_INCLUDED