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/FIFOBufferStream.h

@@ -0,0 +1,154 @@
+//
+// FIFOBufferStream.h
+//
+// Library: Foundation
+// Package: Streams
+// Module:  FIFOBufferStream
+//
+// Definition of the FIFOBufferStream class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_FIFOBufferStream_INCLUDED
+#define Foundation_FIFOBufferStream_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/FIFOBuffer.h"
+#include "Poco/BufferedBidirectionalStreamBuf.h"
+#include <istream>
+#include <ostream>
+
+
+namespace Poco {
+
+
+class Foundation_API FIFOBufferStreamBuf: public BufferedBidirectionalStreamBuf
+	/// This is the streambuf class used for reading from and writing to a FIFOBuffer.
+	/// FIFOBuffer is enabled for emtpy/non-empty/full state transitions notifications.
+{
+public:
+	
+	FIFOBufferStreamBuf();
+		/// Creates a FIFOBufferStreamBuf.
+
+	explicit FIFOBufferStreamBuf(FIFOBuffer& fifoBuffer);
+		/// Creates a FIFOBufferStreamBuf and assigns the given buffer to it.
+
+	FIFOBufferStreamBuf(char* pBuffer, std::size_t length);
+		/// Creates a FIFOBufferStreamBuf and assigns the given buffer to it.
+
+	FIFOBufferStreamBuf(const char* pBuffer, std::size_t length);
+		/// Creates a FIFOBufferStreamBuf and assigns the given buffer to it.
+
+	explicit FIFOBufferStreamBuf(std::size_t length);
+		/// Creates a FIFOBufferStreamBuf of the given length.
+
+	~FIFOBufferStreamBuf();
+		/// Destroys the FIFOBufferStreamBuf.
+
+	FIFOBuffer& fifoBuffer();
+		/// Returns the underlying FIFO buffer reference.
+
+protected:
+	int readFromDevice(char* buffer, std::streamsize length);
+	int writeToDevice(const char* buffer, std::streamsize length);
+
+private:
+	enum 
+	{
+		STREAM_BUFFER_SIZE = 1024
+	};
+
+	FIFOBuffer* _pFIFOBuffer;
+	FIFOBuffer& _fifoBuffer;
+};
+
+
+class Foundation_API FIFOIOS: public virtual std::ios
+	/// The base class for FIFOBufferInputStream and
+	/// FIFOBufferStream.
+	///
+	/// This class is needed to ensure the correct initialization
+	/// order of the stream buffer and base classes.
+{
+public:
+	explicit FIFOIOS(FIFOBuffer& buffer);
+		/// Creates a FIFOIOS and assigns the given buffer to it.
+
+	FIFOIOS(char* pBuffer, std::size_t length);
+		/// Creates a FIFOIOS and assigns the given buffer to it.
+
+	FIFOIOS(const char* pBuffer, std::size_t length);
+		/// Creates a FIFOIOS and assigns the given buffer to it.
+
+	explicit FIFOIOS(std::size_t length);
+		/// Creates a FIFOIOS of the given length.
+		
+	~FIFOIOS();
+		/// Destroys the FIFOIOS.
+		///
+		/// Flushes the buffer.
+		
+	FIFOBufferStreamBuf* rdbuf();
+		/// Returns a pointer to the internal FIFOBufferStreamBuf.
+		
+	void close();
+		/// Flushes the stream.
+
+protected:
+	FIFOBufferStreamBuf _buf;
+};
+
+
+class Foundation_API FIFOBufferStream: public FIFOIOS, public std::iostream
+	/// An output stream for writing to a FIFO.
+{
+public:
+	Poco::BasicEvent<bool>& readable;
+	Poco::BasicEvent<bool>& writable;
+
+	explicit FIFOBufferStream(FIFOBuffer& buffer);
+		/// Creates the FIFOBufferStream with supplied buffer as initial value.
+
+	FIFOBufferStream(char* pBuffer, std::size_t length);
+		/// Creates a FIFOBufferStream and assigns the given buffer to it.
+
+	FIFOBufferStream(const char* pBuffer, std::size_t length);
+		/// Creates a FIFOBufferStream and assigns the given buffer to it.
+
+	explicit FIFOBufferStream(std::size_t length);
+		/// Creates a FIFOBufferStream of the given length.
+
+	~FIFOBufferStream();
+		/// Destroys the FIFOBufferStream.
+		///
+		/// Flushes the buffer.
+
+private:
+	FIFOBufferStream();
+	FIFOBufferStream(const FIFOBufferStream& other);
+	FIFOBufferStream& operator =(const FIFOBufferStream& other);
+};
+
+
+///
+/// inlines
+///
+
+
+inline FIFOBuffer& FIFOBufferStreamBuf::fifoBuffer()
+{
+	return _fifoBuffer;
+}
+
+
+} // namespace Poco
+
+
+#endif // Foundation_FIFOBufferStream_INCLUDED