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/UniqueExpireLRUCache.h

@@ -0,0 +1,70 @@
+//
+// UniqueExpireLRUCache.h
+//
+// Library: Foundation
+// Package: Cache
+// Module:  UniqueExpireLRUCache
+//
+// Definition of the UniqueExpireLRUCache class.
+//
+// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_UniqueExpireLRUCache_INCLUDED
+#define Foundation_UniqueExpireLRUCache_INCLUDED
+
+
+#include "Poco/AbstractCache.h"
+#include "Poco/StrategyCollection.h"
+#include "Poco/UniqueExpireStrategy.h"
+#include "Poco/LRUStrategy.h"
+
+
+namespace Poco {
+
+
+template < 
+	class TKey,
+	class TValue,
+	class TMutex = FastMutex, 
+	class TEventMutex = FastMutex
+>
+class UniqueExpireLRUCache: public AbstractCache<TKey, TValue, StrategyCollection<TKey, TValue>, TMutex, TEventMutex>
+	/// A UniqueExpireLRUCache combines LRU caching and time based per entry expire caching.
+	/// One can define for each cache entry a separate timepoint
+	/// but also limit the size of the cache (per default: 1024).
+	/// Each TValue object must thus offer the following method:
+	///    
+	///    const Poco::Timestamp& getExpiration() const;
+	///    
+	/// which returns the absolute timepoint when the entry will be invalidated.
+	/// Accessing an object will NOT update this absolute expire timepoint.
+	/// You can use the Poco::ExpirationDecorator to add the getExpiration
+	/// method to values that do not have a getExpiration function.
+{
+public:
+	UniqueExpireLRUCache(std::size_t cacheSize = 1024):
+		AbstractCache<TKey, TValue, StrategyCollection<TKey, TValue>, TMutex, TEventMutex>(StrategyCollection<TKey, TValue>())
+	{
+		this->_strategy.pushBack(new LRUStrategy<TKey, TValue>(cacheSize));
+		this->_strategy.pushBack(new UniqueExpireStrategy<TKey, TValue>());
+	}
+
+	~UniqueExpireLRUCache()
+	{
+	}
+
+private:
+	UniqueExpireLRUCache(const UniqueExpireLRUCache& aCache);
+	UniqueExpireLRUCache& operator = (const UniqueExpireLRUCache& aCache);
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_UniqueExpireLRUCache_INCLUDED