Issue #2363987 by Joseph Zhao, mr.baileys, Krzysztof Domański, acrosman, andypost, catch, lauriii: Add theme support for content of 401/403/404 responses

Issue #2890380 by timmillwood, amateescu, acrosman: Remove descriptions of permissions in Content Moderation

Issue #2631468 by snufkin, johnmcc, DamienMcKenna, aaronbauman, kiwad, acrosman, esolitos, Tom Robert, Yogesh Pawar, acke: Menu subtrees in menu blocks show all subitems regardless of the active menu item

Issue #2474047 by arturogarrido, ejabrown, mikeburrelljr, acrosman, lauriii, pwolanin, dawehner: Remove Timer from DrupalKernel