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/PipeStream.h

@@ -0,0 +1,120 @@
+//
+// PipeStream.h
+//
+// Library: Foundation
+// Package: Processes
+// Module:  PipeStream
+//
+// Definition of the PipeStream class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_PipeStream_INCLUDED
+#define Foundation_PipeStream_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/Pipe.h"
+#include "Poco/BufferedStreamBuf.h"
+#include <istream>
+#include <ostream>
+
+
+namespace Poco {
+
+
+class Foundation_API PipeStreamBuf: public BufferedStreamBuf
+	/// This is the streambuf class used for reading from and writing to a Pipe.
+{
+public:
+	typedef BufferedStreamBuf::openmode openmode;
+	
+	PipeStreamBuf(const Pipe& pipe, openmode mode);
+		/// Creates a PipeStreamBuf with the given Pipe.
+
+	~PipeStreamBuf();
+		/// Destroys the PipeStreamBuf.
+		
+	void close();
+		/// Closes the pipe.
+		
+protected:
+	int readFromDevice(char* buffer, std::streamsize length);
+	int writeToDevice(const char* buffer, std::streamsize length);
+
+private:
+	enum 
+	{
+		STREAM_BUFFER_SIZE = 1024
+	};
+
+	Pipe _pipe;
+};
+
+
+class Foundation_API PipeIOS: public virtual std::ios
+	/// The base class for PipeInputStream and
+	/// PipeOutputStream.
+	///
+	/// This class is needed to ensure the correct initialization
+	/// order of the stream buffer and base classes.
+{
+public:
+	PipeIOS(const Pipe& pipe, openmode mode);
+		/// Creates the PipeIOS with the given Pipe.
+		
+	~PipeIOS();
+		/// Destroys the PipeIOS.
+		///
+		/// Flushes the buffer, but does not close the pipe.
+		
+	PipeStreamBuf* rdbuf();
+		/// Returns a pointer to the internal PipeStreamBuf.
+		
+	void close();
+		/// Flushes the stream and closes the pipe.
+
+protected:
+	PipeStreamBuf _buf;
+};
+
+
+class Foundation_API PipeOutputStream: public PipeIOS, public std::ostream
+	/// An output stream for writing to a Pipe.
+{
+public:
+	PipeOutputStream(const Pipe& pipe);
+		/// Creates the PipeOutputStream with the given Pipe.
+
+	~PipeOutputStream();
+		/// Destroys the PipeOutputStream.
+		///
+		/// Flushes the buffer, but does not close the pipe.
+};
+
+
+class Foundation_API PipeInputStream: public PipeIOS, public std::istream
+	/// An input stream for reading from a Pipe.
+	///
+	/// Using formatted input from a PipeInputStream
+	/// is not recommended, due to the read-ahead behavior of
+	/// istream with formatted reads.
+{
+public:
+	PipeInputStream(const Pipe& pipe);
+		/// Creates the PipeInputStream with the given Pipe.
+
+	~PipeInputStream();
+		/// Destroys the PipeInputStream.
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_PipeStream_INCLUDED