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/FormattingChannel.h

@@ -0,0 +1,100 @@
+//
+// FormattingChannel.h
+//
+// Library: Foundation
+// Package: Logging
+// Module:  Formatter
+//
+// Definition of the FormattingChannel class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_FormattingChannel_INCLUDED
+#define Foundation_FormattingChannel_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/Channel.h"
+#include "Poco/Formatter.h"
+#include "Poco/AutoPtr.h"
+
+
+namespace Poco {
+
+
+class Formatter;
+
+
+class Foundation_API FormattingChannel: public Channel
+	/// The FormattingChannel is a filter channel that routes
+	/// a Message through a Formatter before passing it on
+	/// to the destination channel.
+{
+public:
+	using Ptr = AutoPtr<FormattingChannel>;
+
+	FormattingChannel();
+		/// Creates a FormattingChannel.
+		
+	FormattingChannel(Formatter::Ptr pFormatter);
+		/// Creates a FormattingChannel and attaches a Formatter.
+		
+	FormattingChannel(Formatter::Ptr pFormatter, Channel::Ptr pChannel);
+		/// Creates a FormattingChannel and attaches a Formatter
+		/// and a Channel.
+		
+	void setFormatter(Formatter::Ptr pFormatter);
+		/// Sets the Formatter used to format the messages
+		/// before they are passed on. If null, the message
+		/// is passed on unmodified.
+		
+	Formatter::Ptr getFormatter() const;
+		/// Returns the Formatter used to format messages,
+		/// which may be null.
+
+	void setChannel(Channel::Ptr pChannel);
+		/// Sets the destination channel to which the formatted 
+		/// messages are passed on.
+		
+	Channel::Ptr getChannel() const;
+		/// Returns the channel to which the formatted
+		/// messages are passed on.
+		
+	void log(const Message& msg);
+		/// Formats the given Message using the Formatter and
+		/// passes the formatted message on to the destination
+		/// Channel.
+
+	void setProperty(const std::string& name, const std::string& value);
+		/// Sets or changes a configuration property.
+		///
+		/// Only the "channel" and "formatter" properties are supported, which allow
+		/// setting the target channel and formatter, respectively, via the LoggingRegistry.
+		/// The "channel" and "formatter" properties are set-only.
+		///
+		/// Unsupported properties are passed to the attached Channel.
+
+	void open();
+		/// Opens the attached channel.
+		
+	void close();
+		/// Closes the attached channel.
+
+protected:
+	~FormattingChannel();
+
+private:
+	Formatter::Ptr _pFormatter;
+	Channel::Ptr   _pChannel;
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_FormattingChannel_INCLUDED