Issue #2168153 by chx: Add warning to Variable class that it is not a good class to use as a source class example

Revert "Issue #1979468 by Wim Leers, pwolanin, nod_, thedavidmeister, larowlan: .active from linkGenerator(), l() and theme_links() forces an upper limit of per-page caching for all content containing links."

This reverts commit 624296e7.

Issue #2110643 by amateescu, dawehner: ControllerBase::container() and FormBase::container() needs to be private.

Issue #2105915 by vijaycs85, foxtrotcharlie: Make sure all YML files in Block module has no type-casting to string.

Issue #2105991 by nonsie, danilenko_dn, vijaycs85: Make sure all YML files in Statistics module has no type-casting to string.

Issue #2160593 by Wim Leers, vijaycs85: Remove drupal_add_js() from menu.module/remove inline JavaScript from menu.module.

Issue #1027936 by webflo, nicholasThompson: Comment Preprocess sets a links class as a string, should be an array.

Issue #2167169 by pwolanin, tim.plunkett: Clean up Drupal\edit\EditController: remove ContainerAware and inject form_builder.

Revert "Issue #1226044 by pgrond, martin107, roborn, rbayliss: The password_confirm element should not be aware of the user_form_process_password_confirm process."

This reverts commit dc2e4720.

Issue #1979468 by Wim Leers, pwolanin, nod_, thedavidmeister, larowlan: .active from linkGenerator(), l() and theme_links() forces an upper limit of per-page caching for all content containing links.

Issue #2162013 by alexpott, Berdir, sun, pwolanin: Critical performance regression due to config schema + TypedData lookups in installer.

Issue #1898444 by jenlampton, Cottser, lbainbridge, duellj, joelpittet, scor: Rdf.module - Convert theme_ functions to Twig.

Issue #1815504 by pwolanin, Kevin Hankens: File_save_upload() should not alter the file URI string before validation.

Issue #2160581 by vijaycs85, Wim Leers: Remove drupal_add_js() + drupal_add_library() from install.core.inc.

Issue #2145881 by damiankloip, alexpott: Remove string casting from Crypt::hmacBase64(). Throw exceptions instead.

Issue #1226044 by pgrond, martin107, roborn, rbayliss: The password_confirm element should not be aware of the user_form_process_password_confirm process.