Issue #2396473 by herom, Aunion, pjbaert, Manjit.Singh, Dhorkiy, b0unty, prabhurajn654, Dom., Gábor Hojtsy, LewisNyman, idebr: Add missing RTL rules to System CSS

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