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/RandomStream.h

@@ -0,0 +1,73 @@
+//
+// RandomStream.h
+//
+// Library: Foundation
+// Package: Crypt
+// Module:  RandomStream
+//
+// Definition of class RandomInputStream.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_RandomStream_INCLUDED
+#define Foundation_RandomStream_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/BufferedStreamBuf.h"
+#include <istream>
+
+
+namespace Poco {
+
+
+class Foundation_API RandomBuf: public BufferedStreamBuf
+	/// This streambuf generates random data.
+	/// On Windows NT, the cryptographic API is used.
+	/// On Unix, /dev/random is used, if available.
+	/// Otherwise, a random number generator, some
+	/// more-or-less random data and a SHA-1 digest
+	/// is used to generate random data.
+{
+public:
+	RandomBuf();
+	~RandomBuf();
+	int readFromDevice(char* buffer, std::streamsize length);
+};
+
+
+class Foundation_API RandomIOS: public virtual std::ios
+	/// The base class for RandomInputStream.
+	///
+	/// This class is needed to ensure the correct initialization
+	/// order of the stream buffer and base classes.
+{
+public:
+	RandomIOS();
+	~RandomIOS();
+	RandomBuf* rdbuf();
+
+protected:
+	RandomBuf _buf;
+};
+
+
+class Foundation_API RandomInputStream: public RandomIOS, public std::istream
+	/// This istream generates random data
+	/// using the RandomBuf.
+{
+public:
+	RandomInputStream();
+	~RandomInputStream();
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_RandomStream_INCLUDED