Feature: Refs support

[trotyl]

Guide

https://reactjs.org/docs/refs-and-the-dom.html https://reactjs.org/docs/forwarding-refs.html

API

https://reactjs.org/docs/react-api.html#reactcreateref https://reactjs.org/docs/react-api.html#reactforwardref https://reactjs.org/docs/refs-and-the-dom.html#callback-refs