Issue #2349625 by mortendk, alexpott, lauriii, Manuel Garcia, saki007ster, emma.maria, DickJohnson: Copy block templates to Classy

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

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