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/Encodings/testsuite/src/Driver.cpp

@@ -0,0 +1,17 @@
+//
+// Driver.cpp
+//
+// Console-based test driver for Poco Encodings.
+//
+// Copyright (c) 2018, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+
+#include "CppUnit/TestRunner.h"
+#include "EncodingsTestSuite.h"
+
+
+CppUnitMain(EncodingsTestSuite)