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/Base32Encoder.h

@@ -0,0 +1,112 @@
+//
+// Base32Encoder.h
+//
+// Library: Foundation
+// Package: Streams
+// Module:  Base32
+//
+// Definition of class Base32Encoder.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_Base32Encoder_INCLUDED
+#define Foundation_Base32Encoder_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/UnbufferedStreamBuf.h"
+#include <ostream>
+
+
+namespace Poco {
+
+
+class Foundation_API Base32EncoderBuf: public UnbufferedStreamBuf
+	/// This streambuf base32-encodes all data written
+	/// to it and forwards it to a connected
+	/// ostream.
+	///
+	/// Note: The characters are directly written
+	/// to the ostream's streambuf, thus bypassing
+	/// the ostream. The ostream's state is therefore
+	/// not updated to match the buffer's state.
+{
+public:
+	Base32EncoderBuf(std::ostream& ostr, bool padding = true);
+	~Base32EncoderBuf();
+	
+	int close();
+		/// Closes the stream buffer.
+
+private:
+	int writeToDevice(char c);
+
+	unsigned char   _group[5];
+	int             _groupLength;
+	std::streambuf& _buf;
+	bool		_doPadding;
+	
+	static const unsigned char OUT_ENCODING[32];
+	
+	friend class Base32DecoderBuf;
+
+	Base32EncoderBuf(const Base32EncoderBuf&);
+	Base32EncoderBuf& operator = (const Base32EncoderBuf&);
+};
+
+
+class Foundation_API Base32EncoderIOS: public virtual std::ios
+	/// The base class for Base32Encoder.
+	///
+	/// This class is needed to ensure the correct initialization
+	/// order of the stream buffer and base classes.
+{
+public:
+	Base32EncoderIOS(std::ostream& ostr, bool padding = true);
+	~Base32EncoderIOS();
+	int close();
+	Base32EncoderBuf* rdbuf();
+
+protected:
+	Base32EncoderBuf _buf;
+
+private:
+	Base32EncoderIOS(const Base32EncoderIOS&);
+	Base32EncoderIOS& operator = (const Base32EncoderIOS&);
+};
+
+
+class Foundation_API Base32Encoder: public Base32EncoderIOS, public std::ostream
+	/// This ostream base32-encodes all data
+	/// written to it and forwards it to
+	/// a connected ostream.
+	/// Always call close() when done
+	/// writing data, to ensure proper
+	/// completion of the encoding operation.
+	///
+	/// The class implements RFC 4648 - https://tools.ietf.org/html/rfc4648
+	///
+	/// Note: The characters are directly written
+	/// to the ostream's streambuf, thus bypassing
+	/// the ostream. The ostream's state is therefore
+	/// not updated to match the buffer's state.
+{
+public:
+	Base32Encoder(std::ostream& ostr, bool padding = true);
+	~Base32Encoder();
+
+private:
+	Base32Encoder(const Base32Encoder&);
+	Base32Encoder& operator = (const Base32Encoder&);
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_Base32Encoder_INCLUDED