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/ExpireLRUCache.h

@@ -0,0 +1,62 @@
+//
+// ExpireLRUCache.h
+//
+// Library: Foundation
+// Package: Cache
+// Module:  ExpireLRUCache
+//
+// Definition of the ExpireLRUCache class.
+//
+// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_ExpireLRUCache_INCLUDED
+#define Foundation_ExpireLRUCache_INCLUDED
+
+
+#include "Poco/AbstractCache.h"
+#include "Poco/StrategyCollection.h"
+#include "Poco/ExpireStrategy.h"
+#include "Poco/LRUStrategy.h"
+
+
+namespace Poco {
+
+
+template < 
+	class TKey,
+	class TValue,
+	class TMutex = FastMutex, 
+	class TEventMutex = FastMutex
+>
+class ExpireLRUCache: public AbstractCache<TKey, TValue, StrategyCollection<TKey, TValue>, TMutex, TEventMutex>
+	/// An ExpireLRUCache combines LRU caching and time based expire caching.
+	/// It cache entries for a fixed time period (per default 10 minutes)
+	/// but also limits the size of the cache (per default: 1024).
+{
+public:
+	ExpireLRUCache(std::size_t cacheSize = 1024, Timestamp::TimeDiff expire = 600000):
+		AbstractCache<TKey, TValue, StrategyCollection<TKey, TValue>, TMutex, TEventMutex>(StrategyCollection<TKey, TValue>())
+	{
+		this->_strategy.pushBack(new LRUStrategy<TKey, TValue>(cacheSize));
+		this->_strategy.pushBack(new ExpireStrategy<TKey, TValue>(expire));
+	}
+
+	~ExpireLRUCache()
+	{
+	}
+
+private:
+	ExpireLRUCache(const ExpireLRUCache& aCache);
+	ExpireLRUCache& operator = (const ExpireLRUCache& aCache);
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_ExpireLRUCache_INCLUDED