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/Channel.h

@@ -0,0 +1,81 @@
+//
+// Channel.h
+//
+// Library: Foundation
+// Package: Logging
+// Module:  Channel
+//
+// Definition of the Channel class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_Channel_INCLUDED
+#define Foundation_Channel_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/Configurable.h"
+#include "Poco/Mutex.h"
+#include "Poco/RefCountedObject.h"
+#include "Poco/AutoPtr.h"
+
+
+namespace Poco {
+
+
+class Message;
+
+
+class Foundation_API Channel: public Configurable, public RefCountedObject
+	/// The base class for all Channel classes.
+	///
+	/// Supports reference counting based garbage
+	/// collection and provides trivial implementations
+	/// of getProperty() and setProperty().
+{
+public:
+	using Ptr = AutoPtr<Channel>;
+
+	Channel();
+		/// Creates the channel and initializes
+		/// the reference count to one.
+
+	virtual void open();
+		/// Does whatever is necessary to open the channel. 
+		/// The default implementation does nothing.
+		
+	virtual void close();
+		/// Does whatever is necessary to close the channel.
+		/// The default implementation does nothing.
+		
+	virtual void log(const Message& msg) = 0;
+		/// Logs the given message to the channel. Must be
+		/// overridden by subclasses.
+		///
+		/// If the channel has not been opened yet, the log()
+		/// method will open it.
+		
+	void setProperty(const std::string& name, const std::string& value);
+		/// Throws a PropertyNotSupportedException.
+
+	std::string getProperty(const std::string& name) const;
+		/// Throws a PropertyNotSupportedException.
+		
+protected:
+	virtual ~Channel();
+	
+private:
+	Channel(const Channel&);
+	Channel& operator = (const Channel&);
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_Channel_INCLUDED