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/DirectoryIteratorStrategy.h

@@ -0,0 +1,92 @@
+//
+// RecursiveDirectoryIteratorStategies.h
+//
+// Library: Foundation
+// Package: Filesystem
+// Module:  RecursiveDirectoryIterator
+//
+// Definitions of the RecursiveDirectoryIterator stategy classes.
+//
+// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_RecursiveDirectoryIteratorStrategy_INCLUDED
+#define Foundation_RecursiveDirectoryIteratorStrategy_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/DirectoryIterator.h"
+#include <stack>
+#include <queue>
+#include <functional>
+
+
+namespace Poco {
+
+
+class Foundation_API TraverseBase
+{
+public:
+	using Stack = std::stack<DirectoryIterator>;
+	using DepthFun = std::function<UInt16(const Stack&)>;
+
+	enum
+	{
+		D_INFINITE = 0 /// Special value for infinite traverse depth.
+	};
+
+	TraverseBase(DepthFun depthDeterminer, UInt16 maxDepth = D_INFINITE);
+
+protected:
+	bool isFiniteDepth();
+	bool isDirectory(Poco::File& file);
+
+	DepthFun _depthDeterminer;
+	UInt16 _maxDepth;
+	DirectoryIterator _itEnd;
+
+private:
+	TraverseBase();
+	TraverseBase(const TraverseBase&);
+	TraverseBase& operator=(const TraverseBase&);
+};
+
+
+class Foundation_API ChildrenFirstTraverse: public TraverseBase
+{
+public:
+	ChildrenFirstTraverse(DepthFun depthDeterminer, UInt16 maxDepth = D_INFINITE);
+
+	const std::string next(Stack* itStack, bool* isFinished);
+
+private:
+	ChildrenFirstTraverse();
+	ChildrenFirstTraverse(const ChildrenFirstTraverse&);
+	ChildrenFirstTraverse& operator=(const ChildrenFirstTraverse&);
+};
+
+
+class Foundation_API SiblingsFirstTraverse: public TraverseBase
+{
+public:
+	SiblingsFirstTraverse(DepthFun depthDeterminer, UInt16 maxDepth = D_INFINITE);
+
+	const std::string next(Stack* itStack, bool* isFinished);
+
+private:
+	SiblingsFirstTraverse();
+	SiblingsFirstTraverse(const SiblingsFirstTraverse&);
+	SiblingsFirstTraverse& operator=(const SiblingsFirstTraverse&);
+
+	std::stack<std::queue<std::string>> _dirsStack;
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_RecursiveDirectoryIteratorStrategy_INCLUDED