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/XML/include/Poco/DOM/AutoPtr.h

@@ -0,0 +1,35 @@
+//
+// AutoPtr.h
+//
+// Library: XML
+// Package: DOM
+// Module:  DOM
+//
+// Import Poco::AutoPtr into the XML namespace.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef DOM_DOMAutoPtr_INCLUDED
+#define DOM_DOMAutoPtr_INCLUDED
+
+
+#include "Poco/XML/XML.h"
+#include "Poco/AutoPtr.h"
+
+
+namespace Poco {
+namespace XML {
+
+
+using Poco::AutoPtr;
+
+
+} } // namespace Poco::XML
+
+
+#endif // DOM_DOMAutoPtr_INCLUDED