Switch the UI module compatibility to 7.x since we are going to support 9.x actually in the contributor module now.

Issue #3020736 by batkor, Gábor Hojtsy: strpos() expects parameter 1 to be string when the user field was not properly installed, fail gracefully in this case

Issue #3070881 by Sahana _N, joy29, GaëlG, Project Update Bot, Gábor Hojtsy: Fix uses of deperecated APIs and update info files for Drupal 9 compatibility

Issue #2730919 by segi: Port tests to Drupal 8 — skip form UI testing for now while that does not work well yet

Issue #2782615 by rafal.cygnarowski: Uncaught Error: Syntax error, unrecognized expression: :contains

Issue #2705877 by Gábor Hojtsy, Neograph734, nerdoc: Fix instances of wrong localize.drupal.org defaults and other outdated http links

Issue #2643786 by segi: Cannot update interface translation configuration or save local translations after Installing l10n_client

Issue #2630566 by Gábor Hojtsy: Add user field to manage API key to Drupal 8 port step 2 (secure field view, add user specific key)

Break up the Drupal 8 module to two submodules, one dealing with remote submission only to separate the xmlrpc dependency