Issue #1963978 by joelpittet, NickWilde, jmolivas, dimaro, lauriii, Manuel Garcia, 2ndmile, Cottser, tim.plunkett: Convert theme_views_ui_build_group_filter_form() to Twig

Issue #1915026 by steveoliver, 2ndmile, damiankloip, echeese, eromero1, joelpittet, rvilar, waynethayer, Hydra, drupalninja99, dsdeiz: Convert theme_views_ui_container() to Twig.

Issue #1939090 by 2ndmile, hefox, Cottser, shanethehat, steveoliver, jenlampton, mr.baileys, derheap: Convert theme_tablesort_indicator() to Twig.

Issue #1843742 by chrisjlee, joelpittet, 2ndmile: Convert views/templates/views-more.tpl.php to twig.

Issue #1843772 by joelpittet, steveoliver, 2ndmile, Cottser | tostinni: [READY] Convert views/views_ui()/templates/views-ui-display-tab-bucket.tpl.php to Twig.