Issue #2719695 by alexpott, Mile23: Fix 'Drupal.Classes.ClassDeclaration.CloseBraceAfterBody' coding standard

(cherry picked from commit 133c212e)

(cherry picked from commit 8f2c0537)

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

(cherry picked from commit bfde6d34)

Issue #2511516 by lauriii, Xano, Wim Leers, dawehner: Make local tasks and actions hooks provide cacheability metadata, to make the blocks showing them cacheable

Issue #2429617 by Wim Leers, Fabianx, Berdir, yched, dawehner, effulgentsia, catch, borisson_, jhodgdon, martin107, torgosPizza: Make D8 2x as fast: Dynamic Page Cache: context-dependent page caching (for *all* users!)

Issue #2542748 by plach, effulgentsia, jhedstrom, Gábor Hojtsy, alexpott, mpdonadio, catch, dawehner: Automatic entity updates can fail when there is existing content, leaving the site's schema in an unpredictable state

Issue #2535082 by alexpott, jhedstrom, xjm, plach, Fabianx, effulgentsia, Berdir: Allow hook_update_N() implementations to run before the automated entity updates

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

Issue #2392293 by bircher, tim.plunkett, alexpott, cilefen, gobinathm: Refactor hook_system_info_alter implementations to use ModuleUninstallValidatorInterface

Issue #2384481 follow-up by larowlan: [HEAD BROKEN] Fix references to node type properties in Seven theme.

Issue #2395395 by alexpott, effulgentsia, Gábor Hojtsy: TestBase lacks a config method to be used consistently in tests

Issue #2263359 by jhodgdon: hook_help(): Top of page help sections can't link to help pages without a fatal error or checking for help module

Issue #2324055 by dawehner, cilefen, znerol: Split up the module manager into runtime information and extension information

Issue #2349651 by larowlan, yannisc: Fixed Default contact form does not send email as email recipient is not set during the installation.

Revert "Issue #2349651 by yannisc, larowlan: Fixed Default contact form does not send email as email recipient is not set during the installation."

This reverts commit 62f8b460.

Issue #2349651 by yannisc, larowlan: Fixed Default contact form does not send email as email recipient is not set during the installation.

Issue #2195957 by alexpott, tagini: Fixed Only install profile configuration when installing that profile, not when enabling associated modules.

Revert "Issue #2195957 by Wim Leers, alexpott: Fixed Only install profile configuration when installing that profile, not when enabling associated modules."

This reverts commit 5ab43b6a.

Issue #2195957 by Wim Leers, alexpott: Fixed Only install profile configuration when installing that profile, not when enabling associated modules.

Issue #2301045 by Gábor Hojtsy: Fixed Standard profile has views which include elements dependent on uninstalled modules, not valid in config.

Issue #697760 by sun: Replace getInfo() in tests with native phpDoc + annotations (following PHPUnit).

Issue #2289095 by larowlan | pingers: Fixed Frontpage view, feed display renders the node comment form.