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/AccessExpireCache.h

@@ -0,0 +1,63 @@
+//
+// AccessExpireCache.h
+//
+// Library: Foundation
+// Package: Cache
+// Module:  AccessExpireCache
+//
+// Definition of the AccessExpireCache class.
+//
+// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_AccessExpireCache_INCLUDED
+#define Foundation_AccessExpireCache_INCLUDED
+
+
+#include "Poco/AbstractCache.h"
+#include "Poco/AccessExpireStrategy.h"
+
+
+namespace Poco {
+
+
+template <
+	class TKey, 
+	class TValue, 
+	class TMutex = FastMutex, 
+	class TEventMutex = FastMutex
+> 
+class AccessExpireCache: public AbstractCache<TKey, TValue, AccessExpireStrategy<TKey, TValue>, TMutex, TEventMutex>
+	/// An AccessExpireCache caches entries for a fixed time period (per default 10 minutes).
+	/// Entries expire when they are not accessed with get() during this time period. Each access resets
+	/// the start time for expiration.
+	/// Be careful when using an AccessExpireCache. 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:
+	AccessExpireCache(Timestamp::TimeDiff expire = 600000): 
+		AbstractCache<TKey, TValue, AccessExpireStrategy<TKey, TValue>, TMutex, TEventMutex>(AccessExpireStrategy<TKey, TValue>(expire))
+	{
+	}
+
+	~AccessExpireCache()
+	{
+	}
+
+private:
+	AccessExpireCache(const AccessExpireCache& aCache);
+	AccessExpireCache& operator = (const AccessExpireCache& aCache);
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_AccessExpireCache_INCLUDED