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/LoggingFactory.h

@@ -0,0 +1,92 @@
+//
+// LoggingFactory.h
+//
+// Library: Foundation
+// Package: Logging
+// Module:  LoggingFactory
+//
+// Definition of the LoggingFactory class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_LoggingFactory_INCLUDED
+#define Foundation_LoggingFactory_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/DynamicFactory.h"
+#include "Poco/Channel.h"
+#include "Poco/Formatter.h"
+
+
+namespace Poco {
+
+
+class Foundation_API LoggingFactory
+	/// An extensible factory for channels and formatters.
+	///
+	/// The following channel classes are pre-registered:
+	///   - AsyncChannel
+	///   - ConsoleChannel
+	///   - EventLogChannel (Windows platforms only)
+	///   - FileChannel
+	///   - FormattingChannel
+	///   - NullChannel
+	///   - SplitterChannel
+	///   - SyslogChannel (Unix platforms only)
+	///
+	/// The following formatter classes are pre-registered:
+	///   - PatternFormatter
+{
+public:
+	typedef AbstractInstantiator<Channel>   ChannelInstantiator;
+	typedef AbstractInstantiator<Formatter> FormatterFactory;
+
+	LoggingFactory();
+		/// Creates the LoggingFactory.
+		///
+		/// Automatically registers class factories for the
+		/// built-in channel and formatter classes.
+
+	~LoggingFactory();
+		/// Destroys the LoggingFactory.
+
+	void registerChannelClass(const std::string& className, ChannelInstantiator* pFactory);
+		/// Registers a channel class with the LoggingFactory.
+
+	void registerFormatterClass(const std::string& className, FormatterFactory* pFactory);
+		/// Registers a formatter class with the LoggingFactory.
+
+	Channel::Ptr createChannel(const std::string& className) const;
+		/// Creates a new Channel instance from specified class.
+		///
+		/// Throws a NotFoundException if the specified channel class
+		/// has not been registered.
+
+	Formatter::Ptr createFormatter(const std::string& className) const;
+		/// Creates a new Formatter instance from specified class.
+		///
+		/// Throws a NotFoundException if the specified formatter class
+		/// has not been registered.
+
+	static LoggingFactory& defaultFactory();
+		/// Returns a reference to the default
+		/// LoggingFactory.
+
+private:
+	void registerBuiltins();
+
+	DynamicFactory<Channel>   _channelFactory;
+	DynamicFactory<Formatter> _formatterFactory;
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_LoggingFactory_INCLUDED