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/Foundation/src/ThreadTarget.cpp

@@ -0,0 +1,43 @@
+//
+// ThreadTarget.cpp
+//
+// Library: Foundation
+// Package: Threading
+// Module:  ThreadTarget
+//
+// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#include "Poco/ThreadTarget.h"
+
+
+namespace Poco {
+
+
+ThreadTarget::ThreadTarget(Callback method): _method(method)
+{
+}
+
+
+ThreadTarget::ThreadTarget(const ThreadTarget& te): _method(te._method)
+{
+}
+
+
+ThreadTarget& ThreadTarget::operator = (const ThreadTarget& te)
+{
+	_method  = te._method;
+	return *this;
+}
+
+
+ThreadTarget::~ThreadTarget()
+{
+}
+
+
+} // namespace Poco