Low-level console IO support.
Tango Dual License: 3-Clause BSD License / Academic Free License v3.0. See LICENSE_TANGO.txt for details.
Copyright (c) 2004 Kris Bell. Some parts copyright (c) 2009-2016 dunnhumby Germany GmbH. All rights reserved.
Feb 2005: Initial release Nov 2005: Heavily revised for unicode Dec 2006: Outback release