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/DynamicAnyHolder.h

@@ -0,0 +1,24 @@
+//
+// DynamicAnyHolder.h
+//
+// Library: Foundation
+// Package: Dynamic
+// Module:  VarHolder
+//
+// Forward header for VarHolder class to maintain backward compatibility
+//
+// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_DynamicAnyHolder_INCLUDED
+#define Foundation_DynamicAnyHolder_INCLUDED
+
+//@ deprecated
+#include "Poco/Dynamic/VarHolder.h"
+
+
+#endif // Foundation_DynamicAnyHolder_INCLUDED