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/Formatter.h

@@ -0,0 +1,77 @@
+//
+// Formatter.h
+//
+// Library: Foundation
+// Package: Logging
+// Module:  Formatter
+//
+// Definition of the Formatter class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_Formatter_INCLUDED
+#define Foundation_Formatter_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/Configurable.h"
+#include "Poco/AutoPtr.h"
+#include "Poco/RefCountedObject.h"
+
+
+namespace Poco {
+
+
+class Message;
+
+
+class Foundation_API Formatter: public Configurable, public RefCountedObject
+	/// The base class for all Formatter classes.
+	///
+	/// A formatter basically takes a Message object
+	/// and formats it into a string. How the formatting
+	/// is exactly done is up to the implementation of
+	/// Formatter. For example, a very simple implementation
+	/// might simply take the message's Text (see Message::getText()).
+	/// A useful implementation should at least take the Message's
+	/// Time, Priority and Text fields and put them into a string.
+	///
+	/// The Formatter class supports the Configurable interface,
+	/// so the behaviour of certain formatters is configurable.
+	/// It also supports reference counting based garbage collection.
+	/// 
+	/// Trivial implementations of of getProperty() and 
+	/// setProperty() are provided.
+	///
+	/// Subclasses must at least provide a format() method.
+{
+public:
+	using Ptr = AutoPtr<Formatter>;
+
+	Formatter();
+		/// Creates the formatter.
+		
+	virtual ~Formatter();
+		/// Destroys the formatter.
+
+	virtual void format(const Message& msg, std::string& text) = 0;
+		/// Formats the message and places the result in text. 
+		/// Subclasses must override this method.
+		
+	void setProperty(const std::string& name, const std::string& value);
+		/// Throws a PropertyNotSupportedException.
+
+	std::string getProperty(const std::string& name) const;
+		/// Throws a PropertyNotSupportedException.
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_Formatter_INCLUDED