Issue #1798296 by damiankloip, Xano, David_Rothstein, Crell, dawehner: Integrate CSRF link token directly into routing system.

Issue #2057155 by pwolanin, dawehner: Add a generateFromRoute() method on the url generator to accept options like url().

Stupid commit message. :P Fixing. :P

This reverts commit 838bf21e.

Issue #2031353 by pwolanin, dawehner, katbailey: Fixed URLgenerator broken for Drupal installed in a subdirectory - doesn't have a way to get a Drupal path.

Issue #1888424 by katbailey, steveoliver, twistor, beejeebus, effulgentsia: Change notice: Make Drupal's URL generation logic available to HttpKernel, and minimize code repetition/divergence.