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/Util/testsuite/src/SystemConfigurationTest.h

@@ -0,0 +1,39 @@
+//
+// SystemConfigurationTest.h
+//
+// Definition of the SystemConfigurationTest class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef SystemConfigurationTest_INCLUDED
+#define SystemConfigurationTest_INCLUDED
+
+
+#include "Poco/Util/Util.h"
+#include "CppUnit/TestCase.h"
+
+
+class SystemConfigurationTest: public CppUnit::TestCase
+{
+public:
+	SystemConfigurationTest(const std::string& name);
+	~SystemConfigurationTest();
+
+	void testProperties();
+	void testKeys();
+
+	void setUp();
+	void tearDown();
+
+	static CppUnit::Test* suite();
+
+private:
+};
+
+
+#endif // SystemConfigurationTest_INCLUDED