Issue #1817672 by jibran, dawehner, bdgreen, damiankloip: Replace db_select() with an injected database connection in views plugins.

Issue #2002934 by drupee, damiankloip, x.algorithm, kevin.reiss, heddn: Rename Views method validate_argument() to validateArgument().

Issue #2003356 by phenaproxima, jibran, drupalway, Dan Reinders: Rename Views method process_summary_arguments() to processSummaryArguments().

Issue #1849752 by effulgentsia, Berdir, jibran, neclimdul: Abstract non-Drupal-specific parts of AnnotatedClassDiscovery into a Drupal\Component base class.

Issue #1479454 by Hugo Wetterberg, galooph, andypost, marcingy, heyrocker, larowlan, alexpott, tim.plunkett, fubhy, sun, dawehner: Convert user roles to configurables.

Revert "Issue #1479454 by Hugo Wetterberg, galooph, dawehner, andypost, marcingy, heyrocker, larowlan, alexpott, tim.plunkett, fubhy, sun: Change notice: Convert user roles to configurables."

Broke testbot. :(

This reverts commit 2ae15972.

Issue #1479454 by Hugo Wetterberg, galooph, dawehner, andypost, marcingy, heyrocker, larowlan, alexpott, tim.plunkett, fubhy, sun: Change notice: Convert user roles to configurables.