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/URI/src/URI.cpp

@@ -0,0 +1,38 @@
+//
+// URI.cpp
+//
+// This sample demonstrates the URI class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#include "Poco/URI.h"
+#include <iostream>
+
+
+using Poco::URI;
+
+
+int main(int argc, char** argv)
+{
+	URI uri1("http://www.appinf.com:81/sample?example-query#somewhere");
+	
+	std::cout << "Scheme:    " << uri1.getScheme() << std::endl
+	          << "Authority: " << uri1.getAuthority() << std::endl
+	          << "Path:      " << uri1.getPath() << std::endl
+	          << "Query:     " << uri1.getQuery() << std::endl
+	          << "Fragment:  " << uri1.getFragment() << std::endl;
+	          
+	URI uri2;
+	uri2.setScheme("https");
+	uri2.setAuthority("www.appinf.com");
+	uri2.setPath("/another sample");
+	
+	std::cout << uri2.toString() << std::endl;
+	
+	return 0;
+}