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/NullStream.h

@@ -0,0 +1,90 @@
+//
+// NullStream.h
+//
+// Library: Foundation
+// Package: Streams
+// Module:  NullStream
+//
+// Definition of the NullStreamBuf, NullInputStream and NullOutputStream classes.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_NullStream_INCLUDED
+#define Foundation_NullStream_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/UnbufferedStreamBuf.h"
+#include <istream>
+#include <ostream>
+
+
+namespace Poco {
+
+
+class Foundation_API NullStreamBuf: public UnbufferedStreamBuf
+	/// This stream buffer discards all characters written to it.
+	/// Any read operation immediately yields EOF.
+{
+public:
+	NullStreamBuf();
+		/// Creates a NullStreamBuf.
+	
+	~NullStreamBuf();
+		/// Destroys the NullStreamBuf.
+		
+protected:
+	int readFromDevice();
+	int writeToDevice(char c);
+};
+
+
+class Foundation_API NullIOS: public virtual std::ios
+	/// The base class for NullInputStream and NullOutputStream.
+	///
+	/// This class is needed to ensure the correct initialization
+	/// order of the stream buffer and base classes.
+{
+public:
+	NullIOS();
+	~NullIOS();
+
+protected:
+	NullStreamBuf _buf;
+};
+
+
+class Foundation_API NullInputStream: public NullIOS, public std::istream
+	/// Any read operation from this stream immediately
+	/// yields EOF.
+{
+public:
+	NullInputStream();
+		/// Creates the NullInputStream.
+
+	~NullInputStream();
+		/// Destroys the NullInputStream.
+};
+
+
+class Foundation_API NullOutputStream: public NullIOS, public std::ostream
+	/// This stream discards all characters written to it.
+{
+public:
+	NullOutputStream();
+		/// Creates the NullOutputStream.
+	
+	~NullOutputStream();
+		/// Destroys the NullOutputStream.
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_NullStream_INCLUDED