Issue #1898416 by Cottser, joelpittet, drupalninja99, mikl, drupalmonkey, bradwade, pwieck, ezeedub, kerasai, disasm | c4rl: Filter.module - Convert theme_ functions to Twig.
Issue #2143557 by Cottser, webflo, chr.fritsch: Add modules and themes as twig namespaces.
Issue #2176151 by sun: Rebuild.php does not include /core/vendor/autoload.php.
Issue #2180539 by chx: Do not attempt prefixing cross database / schema queries.
Issue #2029537 by Xano, InternetDevels, -enzo- | tsphethean: Replace drupal_sort_weight() with SortArray::sortByWeightElement() and remove drupal_sort_weight().