[React] Raise eslint error levels and fix errors in code (Round 2)

[crucialfelix]

In .eslintrc.json increase these from warning (1) to error (2):

"react/no-deprecated": 1, "react/no-did-mount-set-state": 1, "react/no-did-update-set-state": 1, "react/no-find-dom-node": 1, "react/no-string-refs": 1, "react/prop-types": 1,

These ones require a bit more refactoring and React knowledge.

Defining prop-types is tedious but does eliminate errors.

Some of these components may get refactored into functional components which makes handling refs and set-state lifecycle much simpler.

Run npm run lint:errors and fix all errors.