Issue #2406681 by tstoeckler, hussainweb, alexpott, ParisLiakos, almaudoh, tadityar: Add an autoload.php in the repo root to control the autoloader of front controllers

Issue #1273052 by Chloe Chen: Footer container contents are wider than other page elements in Bartik

Issue #2447831 by gordon: "The content access permissions need to be rebuilt" message not being escaped correctly

Issue #2408491 by joaogarin, mrjmd, vermario, jOksanen: Rewrite button components inline with our CSS standards

Issue #2278073 by cbr, garphy, jonathan_hunt, Berdir: Files with spaces in URIs fail entity TypedData validation

Issue #2429363 by babruix, twistor, filijonka, sun, Mile23, daffie, Wim Leers, chx: Add HTML5-lib to Drupal 8 core for the filter system and for the testing system

Issue #2273923 by mpdonadio, pfrenssen, effulgentsia, pcambra, xjm, tim.plunkett, martin107, cilefen: Remove html => TRUE option from l() and link generator

Issue #2252763 by damiankloip, skipyT, martin107, dawehner, dashaforbes: Views exposed filter form causes enormous form state cache entries

Issue #2431379 by tim.plunkett, Upchuk, dawehner: LazyPluginCollection should not implement \Iterator

Issue #2322639 by hussainweb, LinL, Temoor, oenie, MKorostoff, mglaman, kyuubi, unstatu, omers, pcambra, legolasbo, benjy, JeroenT: Replace all instances of node_type_load(), node_type_get_types(), entity_load('node_type') and entity_load_multiple('node_type') with static method calls from DRUPAL SOUTH WOOOO!