None of the breaking changes seemed to affect current
usage of react-i18next and light testing of features
and language switching did not produce issues.

This update is a pre-requisite for removing deprecated react
lifecycle methods, as older versions of react-i18next
have a higher order component that uses the deprecated
componentWillMount, and that issue has been fixed since 7.8.0.

* feat(welcome-page): Redesign.

* Style adjustments.

This reverts commit d3c5756f7a.

Updates LJM to fix grey overlay with "user is having connectivity
issues" caused by remote track overwrite.

It doesn't seem to work properly.

That is only required if we'd want our backend to authenticate on behalf of our
users. If the app is to authenticate directly it's not needed.

It's impossible to avoid conflicts on a long lived PR like this. Sigh.

This is required due to the Babel update.

It was moved to js-utils, so make use of it.

* Removed unnecessary string wrapping

When a native iOS module implements `constantsToExport` it must define
`requiresMainQueueSetup`. In this case we don't do any UI stuff so it doesn't
need to be initialized in the main thread.

Make sure both methods offer the same behavior and mark the old one as
deprecated so SDK users get a warning.

Fixes too many open files.