react and build refactor

[dufoli]

Enabling Babel would provide the following benefits:

Allows usage of Reacts JSX in components - more concise and cleaner markup in components
Allows usage of features like CSS modules (via babel-plugin-react-css-modules) to build components with better isolation including styling

• update react to 15.5 15.6 or even 15.6.2
• update react version and migrate code
• use dependatbot or mend renovate git bot to keep react and all dependency up to date.
• migrate to typescript with webpack and babel to generate clean code and typed code
• avoid model pattern with didupdate and use setState/ props

sorenkrabbe/Chrome-Salesforce-inspector#165