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/RefCountedObject.h

@@ -0,0 +1,94 @@
+//
+// RefCountedObject.h
+//
+// Library: Foundation
+// Package: Core
+// Module:  RefCountedObject
+//
+// Definition of the RefCountedObject class.
+//
+// Copyright (c) 2004-2009, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_RefCountedObject_INCLUDED
+#define Foundation_RefCountedObject_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/AtomicCounter.h"
+
+
+namespace Poco {
+
+
+class Foundation_API RefCountedObject
+	/// A base class for objects that employ
+	/// reference counting based garbage collection.
+	///
+	/// Reference-counted objects inhibit construction
+	/// by copying and assignment.
+{
+public:
+	RefCountedObject();
+		/// Creates the RefCountedObject.
+		/// The initial reference count is one.
+
+	void duplicate() const;
+		/// Increments the object's reference count.
+		
+	void release() const noexcept;
+		/// Decrements the object's reference count
+		/// and deletes the object if the count
+		/// reaches zero.
+		
+	int referenceCount() const;
+		/// Returns the reference count.
+
+protected:
+	virtual ~RefCountedObject();
+		/// Destroys the RefCountedObject.
+
+private:
+	RefCountedObject(const RefCountedObject&);
+	RefCountedObject& operator = (const RefCountedObject&);
+
+	mutable AtomicCounter _counter;
+};
+
+
+//
+// inlines
+//
+inline int RefCountedObject::referenceCount() const
+{
+	return _counter.value();
+}
+
+
+inline void RefCountedObject::duplicate() const
+{
+	++_counter;
+}
+
+
+inline void RefCountedObject::release() const noexcept
+{
+	try
+	{
+		if (--_counter == 0) delete this;
+	}
+	catch (...)
+	{
+		poco_unexpected();
+	}
+}
+
+
+} // namespace Poco
+
+
+#endif // Foundation_RefCountedObject_INCLUDED