Prioritized theming changes to get in before RC1

gistfile1.txt

RTBC

Needs Review
- Rename menu regions (https://www.drupal.org/node/2513526)
- Remove classes from C templates (https://www.drupal.org/node/2407723)

Needs Work
- Dream markup for tabs (https://www.drupal.org/node/1999182)
- Remove classes from F templates (https://www.drupal.org/node/2407727)
- Remove classes from P templates: very old patch (https://www.drupal.org/node/2407737)
- Move admin theme CSS to Classy (https://www.drupal.org/node/2566775)
- Remove title and wrapper from item list (https://www.drupal.org/node/1842140)

Postponed on other issues
- Remove .module from module CSS (https://www.drupal.org/node/2565797)

Needs plan
- Remove unneeded CSS from core (https://www.drupal.org/node/2566167)

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FIXED
- Theme_view_field to Twig (https://www.drupal.org/node/2348729)
- Override libraries: implement new syntax (https://www.drupal.org/node/2451411)
- Menu classes (https://www.drupal.org/node/2547159)
- Title block (https://www.drupal.org/node/2476947)
- Move remaining module's theme CSS to Classy (https://www.drupal.org/node/2566771)
- Theme_view_fields (https://www.drupal.org/node/2348747)
- Mega patch moving system module CSS to Classy (https://www.drupal.org/node/2566597)
- Views render pipeline double escaping (https://www.drupal.org/node/2560553)
- image-widget (https://www.drupal.org/node/2511036)