Issue #2236855 by rachel_norfolk, stefank, ngocketit, lauriii, LewisNyman, alexpott, yuki77, rteijeiro | mortendk: Use CSS for file icons in file fields.

This reverts commit 354b6647.

Issue #2215507 by Devin Carlson, pfrenssen, SiliconMind: Fixed Downloads broken for translated private files.

Issue #2304969 by pwolanin, cilefen, Berdir, Devin Carlson, klausi: Fixed Port private files access bypass from SA-CORE-2014-003.

Issue #2246675 by rpayanm, johnstorey, holly.ross.drupal | mgbellaire: Remove all unnecessary 'template' lines in hook_theme() declarations.

Issue #2343661 by larowlan, tim.plunkett | xjm: Rename l() to _l() and url() to _url(), and document replacements.

Issue #2328411 by dawehner, geerlingguy, herom: Convert all permissions to yml files and permission callbacks.

Issue #2335659 by tim.plunkett, dawehner, effulgentsia, sun: Remove FormState ArrayAccess usage from core.

Issue #2304399 by er.pushpinderrana, undertext | samuel.mortenson: Fixed "class" attribute in drupal_render should be an array.

Issue #2078473 by blueminds | Berdir: Added Use entity access API for checking access to private files.

Issue #2287727 by yched, swentel, alexpott: Rename Field[instance]Config classes and entity types (again).

Issue #597236 by Berdir, catch, msonnabaum, Xano, Wim Leers, jhedstrom, amateescu, corvus_ch, swentel, moshe weitzman, Gábor Hojtsy, riccardoR, killes@www.drop.org, et al: Add entity caching to core.

Issue #1825952 by Fabianx, joelpittet, bdragon, heddn, chx, xjm, pwolanin, mikey_p, ti2m, bfr, dags, cilefen, scor, mgifford: Turn on twig autoescape by default

Issue #2296237 by er.pushpinderrana: Replace check_plain() to Drupal\Component\Utility\String::checkPlain() in file module.

Issue #2216535 by jhodgdon, Berdir: Replace Node overview topic and Node API topic with Entity Hooks topic.

Issue #2283717 by amitgoyal, joshi.rohit100, g3r4 | jackbravo: Remove user_access function calls on hook_permission functions.

Issue #1898070 by benjifisher, jjcarrion, LinL, idflood, joelpittet, oshelach, tlattimore, Les Lim, sergey.semashko, jesse.d, bdgreen, jenlampton, Cottser, duellj, artofeclipse, vlad.dancer, steveoliver, EVIIILJ, c4rl, elv, OpenChimp: File.module - Convert theme_ functions to Twig.

Issue #2089331 by grom358 | thedavidmeister: [meta] Replace calls to check_plain() with Drupal\Component\Utility\String::checkPlain().

Issue #2211227 by mondrake, xjm | fietserwin: Refactor image and imagetoolkit: isExisting, isSupported, supportedTypes, getMimeType.

Issue #2190313 by pfrenssen, Berdir, amateescu, ianthomas_uk: Add $EntityType::load() and loadMultiple() to simplify loading entities.