Move to React 16.3 and implement new lifecycle methods

Since React 16.3 was out, componentWillReceiveProps is obsolete and has been renamed `UNSAFE_componentWillReceiveProps`. We should replace all its uses with recommended solutions.

Read more at [React's blog](https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html) and [documentation](https://reactjs.org/docs/react-component.html#the-component-lifecycle).

Here are some suggestions for each file. Note that they don't all have the same difficulty !

* [x] src/components/app/ZipFileViewer.js (claimed by @qmya)
Probably can be moved to `componentDidUpdate`
* [x] src/components/shared/Icon.js (claimed by @imabp)
Can be replaced by `componentDidUpdate`
* [x] src/components/shared/IdleSearchField.js (claimed by @qmya)
Probably replaced with a strategy [Fully uncontrolled component with a key](https://reactjs.org/blog/2018/06/07/you-probably-dont-need-derived-state.html#recommendation-fully-uncontrolled-component-with-a-key)
* [x] src/components/shared/TreeView.js (claimed by @mstange)
very possibly memoization
* [ ] src/components/shared/chart/Canvas.js
Strategy unclear. Maybe [Fully uncontrolled component with a key](https://reactjs.org/blog/2018/06/07/you-probably-dont-need-derived-state.html#recommendation-fully-uncontrolled-component-with-a-key).
* [ ] src/components/shared/chart/Viewport.js (claimed by @imabp)
Probably a mix. The parts that call `setSizeNextFrame` can easily be moved to `componentDidUpdate`. The part that compute an horizontalViewport could use a memoization strategy. The part that calls `viewportNeedsUpdate` may use `getDerivedStateFromProps`.
* [x] src/components/tooltip/Tooltip.js (claimed by @Segun-Ogundipe)
Maybe moving it to `componentDidUpdate` works, but this needs careful testing. Possibly a strategy [Fully uncontrolled component with a key](https://reactjs.org/blog/2018/06/07/you-probably-dont-need-derived-state.html#recommendation-fully-uncontrolled-component-with-a-key) is better.

Please comment on this issue to claim a component, and I will add your name to it. Please only work on one at a time, and send in 1 PR for each code path. This will make it easy for multiple people to work on this. We can give some more information where needed.

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-36)