Issue #2575869 by pwolanin, Wim Leers, JeroenT, dawehner, YesCT: Remove all remaining usage of deprecated UrlGeneratorInterface::generateFromPath() and delete it

Issue #2454649 by Aki Tendo, dawehner: Cache Optimization and hardening -- [PP-1] Use assert() instead of exceptions in Cache::merge(Tags|Contexts)

Issue #2529514 by dawehner, Fabianx, Wim Leers: Replace system.filter::protocols with container parameters

Issue #2507831 by dawehner, tim.plunkett, effulgentsia: Harden redirect responses to make external URIs opt in (was SA-CORE-2015-002 foward-port)

Issue #2351015 by plach, effulgentsia, Wim Leers, dawehner, martin107, damiankloip, cilefen, Fabianx, catch, pwolanin, Damien Tournoud, znerol, YesCT, larowlan: URL generation does not bubble cache contexts

Issue #2509300 by dawehner, catch, larowlan: Path alias UI allows node/1 and /node/1 as system path then fatals

Issue #1392754 by tss, justAChris, jhodgdon: Comply with new documentation standards for @file for namespaced class files

Issue #1314214 by stefan.r, phayes, ergophobe, YesCT, damienwhaley, kbasarab, Tor Arne Thune, basic, pfrenssen, yannickoo, simolokid, fietserwin, bzrudi71: MySQL driver does not support full UTF-8 (emojis, asian symbols, mathematical symbols)

Issue #2483781 by borisson_, rbayliss, cilefen, mitalimehta, joshi.rohit100: Move cache contexts classes from \Drupal\Core\Cache to \Drupal\Core\Cache\Context

Issue #2481453 by dawehner, pwolanin, rteijeiro, neclimdul, znerol: Implement query parameter based content negotiation as alternative to extensions

Revert "Issue #1314214 by stefan.r, phayes, ergophobe, YesCT, damienwhaley, Tor Arne Thune, kbasarab, pfrenssen, basic, yannickoo, simolokid: MySQL driver does not support full UTF-8 (emojis, asian symbols, mathematical symbols)"

This reverts commit b105158a.

Issue #1314214 by stefan.r, phayes, ergophobe, YesCT, damienwhaley, Tor Arne Thune, kbasarab, pfrenssen, basic, yannickoo, simolokid: MySQL driver does not support full UTF-8 (emojis, asian symbols, mathematical symbols)

Issue #2335661 by Wim Leers, pwolanin, dawehner, Fabianx, larowlan, catch, Berdir: Outbound path & route processors must specify cacheability metadata

Issue #2381505 by dawehner, pwolanin, aspilicious, rteijeiro: Unserialize preloaded routes on the fly

Issue #2074297 by pwolanin, hussainweb, larowlan: Optimize the code in doGenerate() in the UrlGenerator to take advantage of Drupal path restrictions.

Issue #2463419 by Mile23, rpayanm, hussainweb: Clean-up Test members in core/tests - ensure property definition and use of camelCase naming convention

Issue #2458349 by Wim Leers: Route's access result's cacheability not applied to the response's cacheability

Issue #2451665 by dawehner: Don't rebuild the route on ModuleInstaller::install() (30% installer speedup)

Issue #2455083 by dawehner, larowlan, klausi, David_Rothstein, hefox, tsphethean, dstol, DamienMcKenna, Pere Orga, benjy: Open redirect fixes from SA-CORE-2015-001 need to be ported to Drupal 8

Issue #356399 by dawehner, beejeebus, catch, sidharrell, klausi, nlisgo, Josh Waihi, Berdir, martin107: Optimize the route rebuilding process to rebuild on write

Issue #2281619 by dawehner, tim.plunkett: Convert most direct usages within module code of routing related request attributes to use RouteMatchInterface instead

Issue #2345725 by tim.plunkett: Query parameters are not decoded the same as the path portion of a URL

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

Issue #2351777 by chx, claudiu.cristea: Do not depend on event subscribers for security: Replace AccessRouteSubscriber with build-in checks.