Issue #2813733 by martin107, joachim: Fixed various niggles in FlagViewsRelationship.
Revert "Issue #2760453 by martin107: Fixed config install value should be 0 rather than null."
This reverts commit 02305790c1a71baef85aee9921a1d8dc22c5c9c4.
Issue #2775193 by rbayliss: Fixed Views flag relationship showing wrong value for the relationship flag.
Issue #2760453 by martin107: Fixed config install value should be 0 rather than null.
Issue #2745639 by rbayliss: Fixed regression: Display Options doesn't allow to have none.
Issue #2729095 by chx, socketwench: Expose flag count to views.
Issue #2803189 by martin107: Updated AccessTest documentation and variables for better readability.
Issue #2475893 by chx, socketwench, martin107, ksenzee: Support flagging by anonymous users.
Issue #2776729 by rbayliss: Fixed Flag entity config defines flag texts as string rather than label.
Issue #2787991 by martin107: Extended testing to cover FlagService::unflag().
Issue #2760491 by joachim: Fixed incorrect docs for flag_user_predelete() and flag_entity_predelete().
Issue #2773783 by joachim: Fixed documentation for hook_post_update_NAME() implementation.
Issue #2802653 by jhedstrom, martin107: Fixed UserFlagType::actionAccess() assuming $flaggable is always present.
Issue #2792113 by martin107, Pradnya Pingat: Replaced usage of t() in plugins with $this->t().
Issue #2762831 by martin107: Tidy up FlagTestBase.
Issue #2792189 by Pradnya Pingat: Removed deprecated usage of SafeMarkup::checkPlain from the codebase.
Issue #2584647 by martin107, socketwench, danmuzyka, Berdir, joachim: Fixed access system not extensible.
Issue #2785387 by martin107, Sahil Khambra: Replaced deprecated SafeMarkup::checkPlain with Html::escape.
Issue #2794767 by martin107: Assert action is 'flag' or 'unflag'.
Issue #2792163 by Pradnya Pingat, martin107: Removed Deprecated EntityInterface::urlInfo() from Flag code base.
Issue #2794781 by martin107: Fixed failing tests due to config schema changes.
Issue #2793293 by milodesc: Fixed typo in module name in call to drupal_get_path(), preventing Flag Bookmark from installing.
Added Views plugin for bookmarks view.
Issue #2595079 by omessaoudi: Changed to use token browser popup to improve performance on sites with large number of tokens.
Issue #2599304 by asgorobets, socketwench: Fixed regression; reimplemented Contextual Link Display.
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