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/FileStreamFactory.h

@@ -0,0 +1,61 @@
+//
+// FileStreamFactory.h
+//
+// Library: Foundation
+// Package: URI
+// Module:  FileStreamFactory
+//
+// Definition of the FileStreamFactory class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_FileStreamFactory_INCLUDED
+#define Foundation_FileStreamFactory_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/URIStreamFactory.h"
+
+
+namespace Poco {
+
+
+class Path;
+
+
+class Foundation_API FileStreamFactory: public URIStreamFactory
+	/// An implementation of the URIStreamFactory interface
+	/// that handles file URIs.
+{
+public:
+	FileStreamFactory();
+		/// Creates the FileStreamFactory.
+
+	~FileStreamFactory();
+		/// Destroys the FileStreamFactory.
+		
+	std::istream* open(const URI& uri);
+		/// Creates and opens a file stream in binary mode for the given URI.
+		/// The URI must be either a file URI or a relative URI reference
+		/// containing a path to a local file.
+		///
+		/// Throws an FileNotFound exception if the file cannot
+		/// be opened.
+		
+	std::istream* open(const Path& path);
+		/// Creates and opens a file stream in binary mode for the given path.
+		///
+		/// Throws an FileNotFound exception if the file cannot
+		/// be opened.
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_FileStreamFactory_INCLUDED