boost-use-to-string

This check finds conversion from integer type like int to std::string or std::wstring using boost::lexical_cast, and replace it with calls to std::to_string and std::to_wstring.

It doesn't replace conversion from floating points despite the to_string overloads, because it would change the behaviour.

auto str = boost::lexical_cast<std::string>(42);
auto wstr = boost::lexical_cast<std::wstring>(2137LL);

// Will be changed to
auto str = std::to_string(42);
auto wstr = std::to_wstring(2137LL);