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/Configurable.h

@@ -0,0 +1,70 @@
+//
+// Configurable.h
+//
+// Library: Foundation
+// Package: Logging
+// Module:  Configurable
+//
+// Definition of the Configurable class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_Configurable_INCLUDED
+#define Foundation_Configurable_INCLUDED
+
+
+#include "Poco/Foundation.h"
+
+
+namespace Poco {
+
+
+class Foundation_API Configurable
+	/// A simple interface that defines
+	/// getProperty() and setProperty() methods.
+	///
+	/// This interface is implemented by Formatter and
+	/// Channel and is used to configure arbitrary
+	/// channels and formatters.
+	///
+	/// A property is basically a name-value pair. For
+	/// simplicity, both names and values are strings.
+	/// Every property controls a certain aspect of a
+	/// Formatter or Channel. For example, the PatternFormatter's
+	/// formatting pattern is set via a property.
+	///
+	/// NOTE: The following property names are use internally
+	/// by the logging framework and must not be used by
+	/// channels or formatters:
+	///   - class
+	///   - pattern (Channel)
+	///   - formatter (Channel)
+{
+public:
+	Configurable();
+		/// Creates the Configurable.
+		
+	virtual ~Configurable();
+		/// Destroys the Configurable.
+		
+	virtual void setProperty(const std::string& name, const std::string& value) = 0;
+		/// Sets the property with the given name to the given value.
+		/// If a property with the given name is not supported, a
+		/// PropertyNotSupportedException is thrown.
+		
+	virtual std::string getProperty(const std::string& name) const = 0;
+		/// Returns the value of the property with the given name.
+		/// If a property with the given name is not supported, a
+		/// PropertyNotSupportedException is thrown.
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_Configurable_INCLUDED