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/OrderedMap.h

@@ -0,0 +1,50 @@
+//
+// OrderedMap.h
+//
+// Library: Foundation
+// Package: Core
+// Module:  OrderedMap
+//
+// Definition of the OrderedMap class template.
+//
+// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_OrderedMap_INCLUDED
+#define Foundation_OrderedMap_INCLUDED
+
+
+#include "Poco/Foundation.h"
+
+
+#ifdef min
+#undef min
+#endif
+#ifdef max
+#undef max
+#endif
+#include "Poco/ordered_hash.h"
+#include "Poco/ordered_map.h"
+
+
+namespace Poco {
+
+
+template<class Key,
+		class T,
+		class Hash = std::hash<Key>,
+		class KeyEqual = std::equal_to<Key>,
+		class Allocator = std::allocator<std::pair<Key, T>>,
+		class ValueTypeContainer = std::deque<std::pair<Key, T>, Allocator>>
+using OrderedMap = tsl::ordered_map<Key, T, Hash, KeyEqual, Allocator, ValueTypeContainer>;
+	/// For documentation, see https://tessil.github.io/ordered-map/
+
+
+} // namespace Poco
+
+
+#endif // Foundation_OrderedMap_INCLUDED