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/Void.h

@@ -0,0 +1,73 @@
+//
+// Void.h
+//
+// Library: Foundation
+// Package: Core
+// Module:  Void
+//
+// Definition of the Void class.
+//
+// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_Void_INCLUDED
+#define Foundation_Void_INCLUDED
+
+
+#include "Poco/Foundation.h"
+
+
+namespace Poco {
+
+
+class Foundation_API Void
+	/// A dummy class with value-type semantics, 
+	/// mostly useful as a template argument.
+	///
+	/// This class is typically used together with ActiveMethod,
+	/// if no argument or return value is needed.
+{
+public:
+	Void();
+		/// Creates the Void.
+
+	Void(const Void& v);
+		/// Creates the Void from another Void.
+		///
+		/// The philosophical aspects of this operation 
+		/// remain undiscussed for now.
+		
+	~Void();
+		/// Destroys the Void.
+
+	Void& operator = (const Void& v);
+		/// Assigns another void.
+
+	bool operator ==(const Void& v) const;
+		/// Will return always true due to Voids having no members.
+
+	bool operator !=(const Void& v) const;
+		/// Will return always false due to Voids having no members.
+};
+
+
+inline bool Void::operator ==(const Void& /*v*/) const
+{
+	return true;
+}
+
+
+inline bool Void::operator !=(const Void& /*v*/) const
+{
+	return false;
+}
+
+
+} // namespace Poco
+
+
+#endif // Foundation_Void_INCLUDED