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/testsuite/src/TestStatementImpl.cpp

@@ -0,0 +1,101 @@
+//
+// TestStatementImpl.cpp
+//
+// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#include "TestStatementImpl.h"
+#include "SessionImpl.h"
+
+
+namespace Poco {
+namespace Data {
+namespace Test {
+
+
+TestStatementImpl::TestStatementImpl(SessionImpl& rSession):
+	Poco::Data::StatementImpl(rSession),
+	_compiled(false)
+{
+}
+
+
+TestStatementImpl::~TestStatementImpl()
+{
+}
+
+
+void TestStatementImpl::compileImpl()
+{
+	// prepare binding
+	_ptrBinder    = new Binder;
+	_ptrExtractor = new Extractor;
+	_ptrPreparation   = new Preparator;
+	_compiled = true;
+}
+
+
+bool TestStatementImpl::canBind() const
+{
+	return false;
+}
+
+
+void TestStatementImpl::bindImpl()
+{
+	// bind
+	using Bindings = Poco::Data::AbstractBindingVec;
+	Bindings& binds = bindings();
+	if (binds.empty())
+		return;
+
+	Bindings::iterator it    = binds.begin();
+	Bindings::iterator itEnd = binds.end();
+	std::size_t pos = 0;
+	for (; it != itEnd && (*it)->canBind(); ++it)
+	{
+		(*it)->bind(pos);
+		pos += (*it)->numOfColumnsHandled();
+	}
+}
+
+
+std::size_t TestStatementImpl::columnsReturned() const
+{
+	return 0;
+}
+
+
+const MetaColumn& TestStatementImpl::metaColumn(std::size_t pos) const
+{
+	static MetaColumn c(pos, "", MetaColumn::FDT_BOOL, 0);
+	return c;
+}
+
+
+bool TestStatementImpl::hasNext()
+{
+	return false;
+}
+
+
+std::size_t TestStatementImpl::next()
+{
+	Poco::Data::AbstractExtractionVec::iterator it    = extractions().begin();
+	Poco::Data::AbstractExtractionVec::iterator itEnd = extractions().end();
+	std::size_t pos = 0; 
+	for (; it != itEnd; ++it)
+	{
+		(*it)->extract(pos);
+		pos += (*it)->numOfColumnsHandled();
+	}
+
+	return 1u;
+}
+
+
+} } } // namespace Poco::Data::Test