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/Net/src/NameValueCollection.cpp

@@ -0,0 +1,166 @@
+//
+// NameValueCollection.cpp
+//
+// Library: Net
+// Package: Messages
+// Module:  NameValueCollection
+//
+// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#include "Poco/Net/NameValueCollection.h"
+#include "Poco/Exception.h"
+#include <algorithm>
+
+
+using Poco::NotFoundException;
+
+
+namespace Poco {
+namespace Net {
+
+
+NameValueCollection::NameValueCollection()
+{
+}
+
+
+NameValueCollection::NameValueCollection(const NameValueCollection& nvc):
+	_map(nvc._map)
+{
+}
+
+
+NameValueCollection::NameValueCollection(NameValueCollection&& nvc) noexcept:
+	_map(std::move(nvc._map))
+{
+}
+
+
+NameValueCollection::~NameValueCollection()
+{
+}
+
+
+NameValueCollection& NameValueCollection::operator = (const NameValueCollection& nvc)
+{
+	NameValueCollection tmp(nvc);
+	swap(tmp);
+
+	return *this;
+}
+
+
+NameValueCollection& NameValueCollection::operator = (NameValueCollection&& nvc) noexcept
+{
+	_map = std::move(nvc._map);
+
+	return *this;
+}
+
+
+void NameValueCollection::swap(NameValueCollection& nvc)
+{
+	std::swap(_map, nvc._map);
+}
+
+	
+const std::string& NameValueCollection::operator [] (const std::string& name) const
+{
+	ConstIterator it = _map.find(name);
+	if (it != _map.end())
+		return it->second;
+	else
+		throw NotFoundException(name);
+}
+
+	
+void NameValueCollection::set(const std::string& name, const std::string& value)	
+{
+	Iterator it = _map.find(name);
+	if (it != _map.end())
+		it->second = value;
+	else
+		_map.insert(HeaderMap::ValueType(name, value));
+}
+
+	
+void NameValueCollection::add(const std::string& name, const std::string& value)
+{
+	_map.insert(HeaderMap::ValueType(name, value));
+}
+
+	
+const std::string& NameValueCollection::get(const std::string& name) const
+{
+	ConstIterator it = _map.find(name);
+	if (it != _map.end())
+		return it->second;
+	else
+		throw NotFoundException(name);
+}
+
+
+const std::string& NameValueCollection::get(const std::string& name, const std::string& defaultValue) const
+{
+	ConstIterator it = _map.find(name);
+	if (it != _map.end())
+		return it->second;
+	else
+		return defaultValue;
+}
+
+
+bool NameValueCollection::has(const std::string& name) const
+{
+	return _map.find(name) != _map.end();
+}
+
+
+NameValueCollection::ConstIterator NameValueCollection::find(const std::string& name) const
+{
+	return _map.find(name);
+}
+
+	
+NameValueCollection::ConstIterator NameValueCollection::begin() const
+{
+	return _map.begin();
+}
+
+	
+NameValueCollection::ConstIterator NameValueCollection::end() const
+{
+	return _map.end();
+}
+
+	
+bool NameValueCollection::empty() const
+{
+	return _map.empty();
+}
+
+
+std::size_t NameValueCollection::size() const
+{
+	return _map.size();
+}
+
+
+void NameValueCollection::erase(const std::string& name)
+{
+	_map.erase(name);
+}
+
+
+void NameValueCollection::clear()
+{
+	_map.clear();
+}
+
+
+} } // namespace Poco::Net