Issue #2367743 by rpayanm, Miroling, YesCT, ianthomas_uk, shadik, gaurav.pahuja: Remove usages of drupal_form_submit() and update documentation

Issue #2217731 by crowdcg, lauriii, davidhernandez, aczietlow, jjcarrion, mortendk, karolus, pakmanlh, LewisNyman, aboros, joshua.boltz: Move field classes out of preprocess and into templates

Issue #2353357 by Berdir: hook_stream_wrappers_alter() is broken since modules are not loaded on demand, also change to an event since it's the last hook that forces this during bootstrap

Issue #2170235 by Berdir, penyaskito, larowlan, alexpott, sushyl: file_private_path should be in $settings, like file_public_path

Revert "Issue #2273923 by mpdonadio, pfrenssen, dawehner, xjm, cilefen: Remove html => TRUE option from l() and link generator"

This reverts commit 0bcabf50.

Issue #2273923 by mpdonadio, pfrenssen, dawehner, xjm, cilefen: Remove html => TRUE option from l() and link generator

Issue #2352081 by myforgedoteu, Devin Carlson, martin107: Prevent installation over an already installed database

Issue #2382543 by rpayanm, ianthomas_uk: Remove usage of drupal_html_class() and drupal_clean_css_identifier()

Issue #2167379 by Elijah Lynn, filijonka: db_select docblock should list optional parameters as (optional)

Issue #2226863 by cs_shadow, filijonka, joelpittet, pguillard: Update stale references to theme functions that have been converted to Twig

Issue #2386247 by tstoeckler: install.php should pass the class loader down into install_begin_request()

Issue #1074108 by pwolanin, webchick, BlakeLawson, jayeshanandani, Devin Carlson, harijari, David_Rothstein, c_lehel, Haza, oriol_e9g: Profile selection form not skipped if there is only one visible profile

Issue #2300817 by joshi.rohit100, er.pushpinderrana, tim.plunkett, ianthomas_uk, LinL, dawehner: Remove path_is_admin() as it is deprecated

Issue #2378095 by Wim Leers, Devin Carlson: Convert all remaining attached individual CSS/JS assets to attached asset libraries

Issue #2362227 by dawehner, mpdonadio, znerol, tim.plunkett, skipyT: Replace all instances of current_path()

Issue #2235901 by alexpott, mdrummond, iMiksu, sun, Wim Leers: Remove custom theme settings from *.info.yml

Issue #2381509 by er.pushpinderrana, dawehner: Fix docs for _content being _controller in routing.yml files

Issue #2317913 by jhedstrom: Early error handling can result in fatal error (Call to a member function get() on a non-object)

Issue #2324055 by dawehner, cilefen, znerol: Split up the module manager into runtime information and extension information

Issue #2376013 by pwolanin: Drupal 8 installer initially fails if settings.php and services.yml are correct, but config directories are absent

Issue #2378263 by Wim Leers: hook_library_alter() must be manually invoked by users of LibraryDiscovery, and has no test coverage

Issue #2346937 by dawehner, larowlan, Wim Leers, claudiu.cristea, msonnabaum: Implement a Renderer service; reduces drupal_render / _theme service container calls