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/samples/dir/src/dir.cpp

@@ -0,0 +1,62 @@
+//
+// dir.cpp
+//
+// This sample demonstrates the DirectoryIterator, File and Path classes.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#include "Poco/DirectoryIterator.h"
+#include "Poco/File.h"
+#include "Poco/Path.h"
+#include "Poco/DateTimeFormatter.h"
+#include "Poco/DateTimeFormat.h"
+#include "Poco/Exception.h"
+#include <iostream>
+
+
+using Poco::DirectoryIterator;
+using Poco::File;
+using Poco::Path;
+using Poco::DateTimeFormatter;
+using Poco::DateTimeFormat;
+
+
+int main(int argc, char** argv)
+{
+	std::string dir;
+	if (argc > 1)
+		dir = argv[1];
+	else
+		dir = Path::current();
+		
+	try
+	{
+		DirectoryIterator it(dir);
+		DirectoryIterator end;
+		while (it != end)
+		{
+			Path p(it->path());
+			std::cout << (it->isDirectory() ? 'd' : '-')
+					  << (it->canRead() ? 'r' : '-')
+					  << (it->canWrite() ? 'w' : '-')
+					  << ' '
+					  << DateTimeFormatter::format(it->getLastModified(), DateTimeFormat::SORTABLE_FORMAT)
+					  << ' '
+					  << p.getFileName()
+					  << std::endl;
+			++it;
+		}
+	}
+	catch (Poco::Exception& exc)
+	{
+		std::cerr << exc.displayText() << std::endl;
+		return 1;
+	}
+		
+	return 0;
+}