Merge tips & tricks section into setup checks

core/js/setupchecks.js

core/js/tests/specHelper.js

core/js/tests/specs/setupchecksSpec.js

lib/composer/composer/autoload_classmap.php

lib/composer/composer/autoload_static.php

lib/private/Settings/Admin/TipsTricks.php

lib/private/Settings/Manager.php

settings/Controller/CheckSetupController.php

settings/css/settings.scss

settings/templates/settings/admin/overview.php

settings/templates/settings/admin/tipstricks.php

tests/Settings/Controller/AdminSettingsControllerTest.php

tests/Settings/Controller/CheckSetupControllerTest.php

tests/lib/Settings/Admin/TipsTricksTest.php

tests/lib/Settings/ManagerTest.php