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/Net/testsuite/src/MailTestSuite.h

@@ -0,0 +1,27 @@
+//
+// MailTestSuite.h
+//
+// Definition of the MailTestSuite class.
+//
+// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef MailTestSuite_INCLUDED
+#define MailTestSuite_INCLUDED
+
+
+#include "CppUnit/TestSuite.h"
+
+
+class MailTestSuite
+{
+public:
+	static CppUnit::Test* suite();
+};
+
+
+#endif // MailTestSuite_INCLUDED