Issue #2330181 by esod, ashutoshsngh, gaurav_varshney, ranjeet.paliwal, joshi.rohit100, er.pushpinderrana, oriol_e9g: Remove bootstrap.inc module_invoke()

Issue #2421005 by tim.plunkett: Add \Drupal::hasContainer() instead of checking if \Drupal::getContainer() === NULL

Issue #2348679 by znerol, Wim Leers: Move the remaining procedural page cache code to the page cache stack middleware

Issue #2392787 by beejeebus, dawehner, alexpott: Move include statements from DrupalKernel::boot() into DrupalKernel::preHandle()

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

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

Issue #2328111 by dawehner, martin107, neclimdul: Replace most instances of the DRUPAL_ROOT constant with the app.root container parameter.

Issue #2267551 followup by jfhovinne: [meta] Deal with PHP requirement vs. Debian PHP version numbering.

Issue #2362123 by Wim Leers: Drupal_page_header() and drupal_send_headers() are dead code: already deprecated, zero uses remain: remove.

Issue #2267551 follow-up by jfhovinne: [meta] Deal with PHP requirement vs. Debian PHP version numbering.

Issue #2350877 by dawehner, Wim Leers, hussainweb: Deprecate/rename drupal_add_feed(), drupal_add_html_head(), drupal_add_html_head_link(), drupal_add_http_header(), and allow to be set declaratively in #attached.

Issue #2267551 by jfhovinne, ParisLiakos, catch: PHP 5.4.5 needed to avoid zend failure when using autoloaded traits.

Revert "Issue #2267551 by catch | tim.plunkett: PHP 5.4.5 needed to avoid zend failure when using autoloaded traits."

This reverts commit 8d97ffff.

Issue #1845104 by longwave, thehong | martin_q: Fixed drupal_set_message('0') results in no output rather than outputting "0".

Issue #2267551 by catch | tim.plunkett: PHP 5.4.5 needed to avoid zend failure when using autoloaded traits.

Issue #2289183 by anavarre, xjm: Fixed Temporarily increase D8 memory limit to reflect current requirements.

Issue #2062043 by eelkeblok, longwave, rhm50, InternetDevels, alvar0hurtad0, Xano: Replace user_access() calls with $account->hasPermission() in core files.

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