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/src/DeclHandler.cpp

@@ -0,0 +1,27 @@
+//
+// DeclHandler.cpp
+//
+// Library: XML
+// Package: SAX
+// Module:  SAX
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#include "Poco/SAX/DeclHandler.h"
+
+
+namespace Poco {
+namespace XML {
+
+
+DeclHandler::~DeclHandler()
+{
+}
+
+
+} } // namespace Poco::XML