#2912755 - Enable inline form errors module and add styling

[jochemvn]

Description

Inline form errors will be stable in release 8.4. Let's add support for it in the social themes. This will make the overal experience a lot better.

Drupal

https://www.drupal.org/node/2912755

HTT

• login as admin and Go to extend and enable inline form errors module
• login as a normal user
• Go to Add Event form and submit an empty form. You should see well themed inline form errors which are dismissible alerts. Also on top you see a message with links. The links should be bring you to the correct field.
• Go to edit your profile and leave all fields blank and submit the form. Look at the form feedback and inline form error placement.

Note: The module is not turned on by default. The order of errors in the message is not in the correct order. This is not part of this story.

[jochemvn]

@MaikelGG, please add some test steps.

If the tests are green you can merge