* Fix containers not being focusable
* Fix tests to allow for focusable containers
* Add test for non-focusable container with focusable children
* Fix a typo in a test
* Move focusing logic to the Screen level
* Update tests to support per-screen focus management
* Some additional key name replacements
* Improve rendering of bindings in footer when multiple items have same action
* Clean up footer, allow key_displays csv
* Prevent exception when widget is not in screen