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/BufferAllocator.h

@@ -0,0 +1,52 @@
+//
+// BufferAllocator.h
+//
+// Library: Foundation
+// Package: Streams
+// Module:  BufferAllocator
+//
+// Definition of the BufferAllocator class.
+//
+// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_BufferAllocator_INCLUDED
+#define Foundation_BufferAllocator_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include <ios>
+#include <cstddef>
+
+
+namespace Poco {
+
+
+template <typename ch>
+class BufferAllocator
+	/// The BufferAllocator used if no specific
+	/// BufferAllocator has been specified.
+{
+public:
+	typedef ch char_type;
+
+	static char_type* allocate(std::streamsize size)
+	{
+		return new char_type[static_cast<std::size_t>(size)];
+	}
+	
+	static void deallocate(char_type* ptr, std::streamsize /*size*/) noexcept
+	{
+		delete [] ptr;
+	}
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_BufferAllocator_INCLUDED