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/MD4Engine.h

@@ -0,0 +1,95 @@
+//
+// MD4Engine.h
+//
+// Library: Foundation
+// Package: Crypt
+// Module:  MD4Engine
+//
+// Definition of class MD4Engine.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+//
+// MD4 (RFC 1320) algorithm:
+// Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
+// rights reserved.
+//
+// License to copy and use this software is granted provided that it
+// is identified as the "RSA Data Security, Inc. MD4 Message-Digest
+// Algorithm" in all material mentioning or referencing this software
+// or this function.
+//
+// License is also granted to make and use derivative works provided
+// that such works are identified as "derived from the RSA Data
+// Security, Inc. MD4 Message-Digest Algorithm" in all material
+// mentioning or referencing the derived work.
+//
+// RSA Data Security, Inc. makes no representations concerning either
+// the merchantability of this software or the suitability of this
+// software for any particular purpose. It is provided "as is"
+// without express or implied warranty of any kind.
+//
+// These notices must be retained in any copies of any part of this
+// documentation and/or software.
+//
+
+
+#ifndef Foundation_MD4Engine_INCLUDED
+#define Foundation_MD4Engine_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/DigestEngine.h"
+
+
+namespace Poco {
+
+
+class Foundation_API MD4Engine: public DigestEngine
+	/// This class implements the MD4 message digest algorithm,
+	/// described in RFC 1320.
+{
+public:
+	enum
+	{
+		BLOCK_SIZE  = 64,
+		DIGEST_SIZE = 16
+	};
+
+	MD4Engine();
+	~MD4Engine();
+		
+	std::size_t digestLength() const;
+	void reset();
+	const DigestEngine::Digest& digest();
+
+protected:
+	void updateImpl(const void* data, std::size_t length);
+
+private:
+	static void transform(UInt32 state[4], const unsigned char block[64]);
+	static void encode(unsigned char* output, const UInt32* input, std::size_t len);
+	static void decode(UInt32* output, const unsigned char* input, std::size_t len);
+
+	struct Context
+	{
+		UInt32 state[4];          // state (ABCD)
+		UInt32 count[2];          // number of bits, modulo 2^64 (lsb first)
+		unsigned char buffer[64]; // input buffer
+	};
+
+	Context _context;
+	DigestEngine::Digest _digest;
+
+	MD4Engine(const MD4Engine&);
+	MD4Engine& operator = (const MD4Engine&);
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_MD5Engine_INCLUDED