* upgrade Ember CLI to 3.13 and Ember Source + Ember Data to 3.12
Ember Source upgrade to 3.13 is blocked by Ember CP Validations,
which does not support Ember Source 3.13 yet.
Ember Data upgrade to 3.13 is blocked by Ember Data Model Fragments,
which does not support Ember Data 3.13 yet.
Also removes autofocus mixin and inlines the code as mixins are
considered an antipattern in latest Ember versions.
Removes some left overs in `"resolutions"` key. But that shouldn't have a real impact.
Ember Bootstrap has changed a lot since the very outdated pre 1.0 release
which was used here. Changes are mostly about using composable components
and closure actions.
Also replaces PhantomJS with Chrome in CI cause PhantomJS is also very
outdated and causing test failure not related to any real world issues.
Ember CLI has replaced PhantomJS with Chrome in v2.15.1, which is the
upfollowing minor release to the version currently used.
