Add React Native Web

React Native Web allows for cross platform development made easy this would allow for bitshares to build a mobile app along with desktop app and web version all in one code base. Also allows for better code structure and remove reliance on css in the long term. Allowing for colocation of component with style.

https://github.com/necolas/react-native-web

Start by reviewing the existing bitshares-ui frontend and the React Native Web project linked in the issue. Determine the scope of adopting React Native Web across the mobile, desktop, and web targets; done would mean the agreed cross-platform integration is implemented and the existing application remains usable.

Written by the indexing model from the issue text.