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/ExpireCache.h

@@ -0,0 +1,65 @@
+//
+// ExpireCache.h
+//
+// Library: Foundation
+// Package: Cache
+// Module:  ExpireCache
+//
+// Definition of the ExpireCache class.
+//
+// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_ExpireCache_INCLUDED
+#define Foundation_ExpireCache_INCLUDED
+
+
+#include "Poco/AbstractCache.h"
+#include "Poco/ExpireStrategy.h"
+
+
+namespace Poco {
+
+
+template <
+	class TKey, 
+	class TValue, 
+	class TMutex = FastMutex, 
+	class TEventMutex = FastMutex
+> 
+class ExpireCache: public AbstractCache<TKey, TValue, ExpireStrategy<TKey, TValue>, TMutex, TEventMutex>
+	/// An ExpireCache caches entries for a fixed time period (per default 10 minutes).
+	/// Entries expire independently of the access pattern, i.e. after a constant time.
+	/// If you require your objects to expire after they were not accessed for a given time
+	/// period use a Poco::AccessExpireCache.
+	///
+	/// Be careful when using an ExpireCache. A cache is often used
+	/// like cache.has(x) followed by cache.get x). Note that it could happen
+	/// that the "has" call works, then the current execution thread gets descheduled, time passes,
+	/// the entry gets invalid, thus leading to an empty SharedPtr being returned 
+	/// when "get" is invoked.
+{
+public:
+	ExpireCache(Timestamp::TimeDiff expire = 600000): 
+		AbstractCache<TKey, TValue, ExpireStrategy<TKey, TValue>, TMutex, TEventMutex>(ExpireStrategy<TKey, TValue>(expire))
+	{
+	}
+
+	~ExpireCache()
+	{
+	}
+
+private:
+	ExpireCache(const ExpireCache& aCache);
+	ExpireCache& operator = (const ExpireCache& aCache);
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_ExpireCache_INCLUDED