Issue #2878548 by alexpott, droplet, Cottser, idebr, joelpittet, xjm, martin107: Fix CSS whitespace issues

Issue #2408525 by MathieuSpil, cosmicdreams, Manjit.Singh, njbarrett, kamalpreetkaur, LewisNyman, axe312, dawehner: Rewrite Views UI CSS inline with our CSS standards - Part 1

Issue #2315015 by alexpott, gauravkhambhala, longwave: Remove progress-disabled class and associated CSS

Issue #1831894 by dead_arm, idebr, technicka, dawehner, Bojhan, damiankloip: Users miss "save" button and can't distinguish "editable" and "preview" areas

Issue #2207695 by Manuel Garcia, LewisNyman, pakmanlh, mitsuroseba, Sam152: Expand the throbber API to include a 'full screen' option.

Issue #1989470 by LewisNyman, aboros, philipz, mgifford, rteijeiro, dimaro, Bès, klonos, emma.maria: Dropbutton style update for Seven.

Issue #1851414 by nod_, quicksketch, frega, dawehner, damiankloip: Convert Views to use the abstracted dialog modal.

Issue #2015789 by fubhy, echoz, rteijeiro, LewisNyman, penyaskito: Remove language_css_alter() (RTL stylesheets) in favor of HTML 'dir' attribute.

Issue #1987066 by Kevin Morse, JohnAlbin, rteijeiro, echoz, ry5n: Rename files to match CSS file naming convention.

Issue #1820414 by damiankloip, tim.plunkett, xjm: Move views_ui().module directly into /core/modules/.

Issue #1832872 by dead_arm, Hydra, tim.plunkett, dawehner: Add visual emphasis on search box/filtering.

Issue #1168246 by sun, mgifford, Manuel Garcia, mbrett5062, ry5n, Everett Zufelt, nod_, aspilicious, deviantintegral, tim.plunkett: Freedom For Fieldsets! Long Live The DETAILS.