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/NamedMutex_WIN32U.h

@@ -0,0 +1,47 @@
+//
+// NamedMutex_WIN32U.h
+//
+// Library: Foundation
+// Package: Processes
+// Module:  NamedMutex
+//
+// Definition of the NamedMutexImpl class for Windows.
+//
+// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_NamedMutex_WIN32U_INCLUDED
+#define Foundation_NamedMutex_WIN32U_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/UnWindows.h"
+
+
+namespace Poco {
+
+
+class Foundation_API NamedMutexImpl
+{
+protected:
+	NamedMutexImpl(const std::string& name);
+	~NamedMutexImpl();
+	void lockImpl();
+	bool tryLockImpl();
+	void unlockImpl();
+	
+private:
+	std::string  _name;
+	std::wstring _uname;
+	HANDLE       _mutex;
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_NamedMutex_WIN32U_INCLUDED