Issue #2226863 by cs_shadow, filijonka, joelpittet, pguillard: Update stale references to theme functions that have been converted to Twig

Issue #2246661 by ivanjaros: Some templates are missing 'Default theme implementation ..' statement.

Issue #2114563 by joelpittet, martin107, Cottser: Remove TwigReference with the help of 'without' filter replacing 'show'/'hide' functions.

Issue #1898432 by WebDevDude, steveoliver, vlad.dancer, jenlampton, pixelmord, Fabianx, iztok, EVIIILJ, jwilson3, c4rl, Cottser: Convert node module to Twig.