Add support for the about screen.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Move log into a new utility module.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Implement selecting previous view.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>