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/include/Poco/PipeImpl.h

@@ -0,0 +1,37 @@
+//
+// PipeImpl.h
+//
+// Library: Foundation
+// Package: Processes
+// Module:  PipeImpl
+//
+// Definition of the PipeImpl class.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_PipeImpl_INCLUDED
+#define Foundation_PipeImpl_INCLUDED
+
+
+#include "Poco/Foundation.h"
+
+
+#if defined(POCO_OS_FAMILY_WINDOWS)
+#if defined(_WIN32_WCE)
+#include "PipeImpl_DUMMY.h"
+#else
+#include "Poco/PipeImpl_WIN32.h"
+#endif
+#elif defined(POCO_OS_FAMILY_UNIX)
+#include "Poco/PipeImpl_POSIX.h"
+#else
+#include "Poco/PipeImpl_DUMMY.h"
+#endif
+
+
+#endif // Foundation_PipeImpl_INCLUDED