Merge branch 'develop-next' into 1.11.x

include/class.auth.php

include/class.client.php

include/class.config.php

include/class.cron.php

include/class.forms.php

include/class.mailer.php

include/class.staff.php

include/class.user.php

include/class.variable.php

include/staff/tasks.inc.php

include/staff/ticket-view.inc.php