Issue #1445224 by Niklas Fiekas, sun, Tor Arne Thune: Add new HTML5 FAPI element: color.

core/includes/common.inc

core/includes/form.inc

core/lib/Drupal/Core/Utility/Color.php

.../modules/simpletest/lib/Drupal/simpletest/WebTestBase.php

...dules/system/lib/Drupal/system/Tests/Common/ColorTest.php

.../modules/system/lib/Drupal/system/Tests/Form/FormTest.php

core/modules/system/system.module

core/modules/system/tests/modules/form_test/form_test.module

core/themes/bartik/css/style.css

core/themes/seven/style.css