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/Data/testsuite/src/DataTestSuite.cpp

@@ -0,0 +1,24 @@
+//
+// DataTestSuite.cpp
+//
+// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#include "DataTestSuite.h"
+#include "DataTest.h"
+#include "SessionPoolTest.h"
+
+
+CppUnit::Test* DataTestSuite::suite()
+{
+	CppUnit::TestSuite* pSuite = new CppUnit::TestSuite("DataTestSuite");
+
+	pSuite->addTest(DataTest::suite());
+	pSuite->addTest(SessionPoolTest::suite());
+
+	return pSuite;
+}