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/Data/src/RowIterator.cpp

@@ -0,0 +1,221 @@
+//
+// RowIterator.cpp
+//
+// Library: Data
+// Package: DataCore
+// Module:  RowIterator
+//
+// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#include "Poco/Data/RowIterator.h"
+#include "Poco/Data/RecordSet.h"
+#undef min
+#undef max
+#include <limits>
+
+
+namespace Poco {
+namespace Data {
+
+
+const std::size_t RowIterator::POSITION_END = std::numeric_limits<std::size_t>::max();
+
+
+RowIterator::RowIterator(RecordSet* pRecordSet, bool positionEnd): 
+	_pRecordSet(pRecordSet),
+	_position(positionEnd ? POSITION_END : 0)
+{
+}
+
+
+RowIterator::RowIterator(const RowIterator& other):
+	_pRecordSet(other._pRecordSet),
+	_position(other._position)
+{
+}
+
+
+RowIterator::RowIterator(RowIterator&& other) noexcept:
+	_pRecordSet(std::move(other._pRecordSet)),
+	_position(std::move(other._position))
+{
+}
+
+RowIterator::~RowIterator()
+{
+}
+
+
+RowIterator& RowIterator::operator = (const RowIterator& other)
+{
+	RowIterator tmp(other);
+	swap(tmp);
+	return *this;
+}
+
+
+RowIterator& RowIterator::operator = (RowIterator&& other) noexcept
+{
+	_pRecordSet = std::move(other._pRecordSet);
+	_position = std::move(other._position);
+	return *this;
+}
+
+
+void RowIterator::swap(RowIterator& other)
+{
+	using std::swap;
+	
+	swap(_pRecordSet, other._pRecordSet);
+	swap(_position, other._position);
+}
+
+
+void RowIterator::increment() const
+{
+	if (POSITION_END == _position)
+		throw RangeException("End of iterator reached.");
+
+	if (_position < _pRecordSet->subTotalRowCount() - 1)
+		++_position;
+	else
+		_position = POSITION_END;
+
+	if (_pRecordSet->getFilter() && POSITION_END != _position)
+	{
+		while (!_pRecordSet->isAllowed(_position))
+		{
+			increment();
+			if (POSITION_END == _position) break;
+		}
+	}
+}
+
+
+void RowIterator::decrement() const
+{
+	if (0 == _position)
+		throw RangeException("Beginning of iterator reached.");
+	else if (POSITION_END == _position)
+		_position = _pRecordSet->subTotalRowCount() - 1;
+	else
+		--_position;
+
+	if (_pRecordSet->getFilter() && 0 != _position)
+	{
+		while (!_pRecordSet->isAllowed(_position))
+		{
+			decrement();
+			if (0 == _position) break;
+		}
+	}
+}
+
+
+void RowIterator::setPosition(std::size_t pos) const
+{
+	if (_position == pos) return;
+
+	if (_pRecordSet->getFilter())
+	{
+		std::size_t start = _position;
+		if (_position > pos)
+		{
+			std::size_t end = _position - pos;
+			for (; start > end; --start)
+			{
+				if (pos) --pos;
+				else throw RangeException("Invalid position argument.");
+			}
+		}
+		else
+		{
+			std::size_t end = pos - _position;
+			for (; start < end; ++start)
+			{
+				if (_pRecordSet->subTotalRowCount() != pos) ++pos;
+				else throw RangeException("Invalid position argument.");
+			}
+		}
+	}
+
+	if (pos < _pRecordSet->subTotalRowCount())
+		_position = pos;
+	else if (pos == _pRecordSet->subTotalRowCount())
+		_position = POSITION_END;
+	else
+		throw RangeException("Invalid position argument.");
+}
+
+
+Row& RowIterator::operator * () const
+{
+	if (POSITION_END == _position)
+		throw InvalidAccessException("End of iterator reached.");
+
+	return _pRecordSet->row(_position);
+}
+
+
+Row* RowIterator::operator -> () const
+{
+	if (POSITION_END == _position)
+		throw InvalidAccessException("End of iterator reached.");
+
+	return &_pRecordSet->row(_position);
+}
+
+
+const RowIterator& RowIterator::operator ++ () const
+{
+	increment();
+	return *this;
+}
+
+
+RowIterator RowIterator::operator ++ (int) const
+{
+	RowIterator old(*this);
+	increment();
+	return old;
+}
+
+
+const RowIterator& RowIterator::operator -- () const
+{
+	decrement();
+	return *this;
+}
+
+
+RowIterator RowIterator::operator -- (int) const
+{
+	RowIterator old(*this);
+	decrement();
+	return old;
+}
+
+
+RowIterator RowIterator::operator + (std::size_t diff) const
+{
+	RowIterator ri(*this);
+	ri.setPosition(_position + diff);
+	return ri;
+}
+
+
+RowIterator RowIterator::operator - (std::size_t diff) const
+{
+	if (diff > _position) throw RangeException("Invalid position argument.");
+	RowIterator ri(*this);
+	ri.setPosition(_position - diff);
+	return ri;
+}
+
+
+} } // namespace Poco::Data