Task
Use Twig instead of PHPTemplate
Twig sandbox: http://drupal.org/sandbox/pixelmord/1750250
Remaining
- Replace all theme functions and templates with .html.twig equivalent templates
- Add new preprocess functions for the .html.twig equivalent templates
- Update all hook_theme definitions
Related
#1778968: Convert theme_table to Twig
#1885560: [meta] Convert everything in theme.inc to Twig