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/SplitterChannel.h

@@ -0,0 +1,80 @@
+//
+// SplitterChannel.h
+//
+// Library: Foundation
+// Package: Logging
+// Module:  SplitterChannel
+//
+// Definition of the SplitterChannel class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_SplitterChannel_INCLUDED
+#define Foundation_SplitterChannel_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/Channel.h"
+#include "Poco/Mutex.h"
+#include "Poco/AutoPtr.h"
+#include <vector>
+
+
+namespace Poco {
+
+
+class Foundation_API SplitterChannel: public Channel
+	/// This channel sends a message to multiple
+	/// channels simultaneously.
+{
+public:
+	using Ptr = AutoPtr<SplitterChannel>;
+
+	SplitterChannel();
+		/// Creates the SplitterChannel.
+
+	void addChannel(Channel::Ptr pChannel);
+		/// Attaches a channel, which may not be null.
+		
+	void removeChannel(Channel::Ptr pChannel);
+		/// Removes a channel.
+
+	void log(const Message& msg);
+		/// Sends the given Message to all
+		/// attaches channels. 
+
+	void setProperty(const std::string& name, const std::string& value);
+		/// Sets or changes a configuration property.
+		///
+		/// Only the "channel" property is supported, which allows
+		/// adding a comma-separated list of channels via the LoggingRegistry.
+		/// The "channel" property is set-only.
+		/// To simplify file-based configuration, all property
+		/// names starting with "channel" are treated as "channel".
+
+	void close();
+		/// Removes all channels.
+		
+	int count() const;
+		/// Returns the number of channels in the SplitterChannel.
+
+protected:
+	~SplitterChannel();
+
+private:
+	typedef std::vector<Channel::Ptr> ChannelVec;
+	
+	ChannelVec        _channels;
+	mutable FastMutex _mutex;
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_SplitterChannel_INCLUDED