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/TeeStream.h

@@ -0,0 +1,132 @@
+//
+// TeeStream.h
+//
+// Library: Foundation
+// Package: Streams
+// Module:  TeeStream
+//
+// Definition of the TeeStream class.
+//
+// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_TeeStream_INCLUDED
+#define Foundation_TeeStream_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/UnbufferedStreamBuf.h"
+#include <vector>
+#include <istream>
+#include <ostream>
+
+
+namespace Poco {
+
+
+class Foundation_API TeeStreamBuf: public UnbufferedStreamBuf
+	/// This stream buffer copies all data written to or
+	/// read from it to one or multiple output streams.
+{
+public:
+	TeeStreamBuf();
+		/// Creates an unconnected CountingStreamBuf.
+		/// Use addStream() to attach output streams.
+	
+	TeeStreamBuf(std::istream& istr);
+		/// Creates the CountingStreamBuf and connects it
+		/// to the given input stream.
+
+	TeeStreamBuf(std::ostream& ostr);
+		/// Creates the CountingStreamBuf and connects it
+		/// to the given output stream.
+
+	~TeeStreamBuf();
+		/// Destroys the CountingStream.
+
+	void addStream(std::ostream& ostr);
+		/// Adds the given output stream.
+
+protected:
+	int readFromDevice();
+	int writeToDevice(char c);
+
+private:
+	typedef std::vector<std::ostream*> StreamVec;
+	
+	std::istream* _pIstr;
+	StreamVec     _streams;
+};
+
+
+class Foundation_API TeeIOS: public virtual std::ios
+	/// The base class for TeeInputStream and TeeOutputStream.
+	///
+	/// This class is needed to ensure the correct initialization
+	/// order of the stream buffer and base classes.
+{
+public:
+	TeeIOS();
+		/// Creates the basic stream and leaves it unconnected.
+
+	TeeIOS(std::istream& istr);
+		/// Creates the basic stream and connects it
+		/// to the given input stream.
+
+	TeeIOS(std::ostream& ostr);
+		/// Creates the basic stream and connects it
+		/// to the given output stream.
+
+	~TeeIOS();
+		/// Destroys the stream.
+
+	void addStream(std::ostream& ostr);
+		/// Adds the given output stream.
+
+	TeeStreamBuf* rdbuf();
+		/// Returns a pointer to the underlying streambuf.
+
+protected:
+	TeeStreamBuf _buf;
+};
+
+
+class Foundation_API TeeInputStream: public TeeIOS, public std::istream
+	/// This stream copies all characters read through it
+	/// to one or multiple output streams.
+{
+public:
+	TeeInputStream(std::istream& istr);
+		/// Creates the TeeInputStream and connects it
+		/// to the given input stream.
+
+	~TeeInputStream();
+		/// Destroys the TeeInputStream.
+};
+
+
+class Foundation_API TeeOutputStream: public TeeIOS, public std::ostream
+	/// This stream copies all characters written to it
+	/// to one or multiple output streams.
+{
+public:
+	TeeOutputStream();
+		/// Creates an unconnected TeeOutputStream.
+	
+	TeeOutputStream(std::ostream& ostr);
+		/// Creates the TeeOutputStream and connects it
+		/// to the given input stream.
+
+	~TeeOutputStream();
+		/// Destroys the TeeOutputStream.
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_TeeStream_INCLUDED