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/XML/testsuite/src/TreeWalkerTest.h

@@ -0,0 +1,41 @@
+//
+// TreeWalkerTest.h
+//
+// Definition of the TreeWalkerTest class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef TreeWalkerTest_INCLUDED
+#define TreeWalkerTest_INCLUDED
+
+
+#include "Poco/XML/XML.h"
+#include "CppUnit/TestCase.h"
+
+
+class TreeWalkerTest: public CppUnit::TestCase
+{
+public:
+	TreeWalkerTest(const std::string& name);
+	~TreeWalkerTest();
+
+	void testShowAll();
+	void testShowElements();
+	void testFilter();
+	void testShowNothing();
+
+	void setUp();
+	void tearDown();
+
+	static CppUnit::Test* suite();
+
+private:
+};
+
+
+#endif // TreeWalkerTest_INCLUDED