Issue #2505931 by stefan.r, akalata, cilefen, pwolanin, joelpittet, YesCT, alexpott, davidhernandez, larowlan, colbol, xjm, Wim Leers, dawehner, Cottser, catch: Remove SafeMarkup::set in ViewListBuilder

Issue #2395853 by LewisNyman, Manjit.Singh, nlisgo, pjbaert, Branislav Bujisic, pguillard, gavin.hughes, onelittlebecca, alisonjo2786, camoa, DickJohnson, manmohandream, davidhernandez, kgoel: Split system.module.css and system.theme.css files into SMACSS style components