Problem/Motivation
#1921610: [Meta] Architect our CSS
The BAT (base-admin-theme) file organization we started to do in Drupal 8 was a fantastic idea. See http://drupal.org/node/1089868
It works really well, but its names conflict with the SMACSS categorization we're using in Drupal 8. "base" and "theme" means something else in SMACSS. So we just need to rename them.
The field module does not yet follow these guidelines.
Proposed resolution
field.css becomes field.module.css
field-rtl.css becomes field.module-rtl.css
In addition, since our template files are now in a templates sub-directory of a module, we should do the same for the CSS. Note that the toolbar, tour and views modules already do that.
This is part of the CSS standard described at http://drupal.org/node/1887922
Remaining tasks
Test if with this patch the CSS is being added to Drupal from its new location with its new name
User interface changes
none
API changes
The system.module's CSS files will have new names.