Implement keyboard navigation in core elements like GCDialog, readyButton, etc and handle focus on start and close of these elements.
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Description
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I've been working on this for several weeks now... almost done, but probably still a few places to fix.
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I think I've added keyboard support where possible in core elements now, closing as resolved.
(note: for readyButton, for convenience it is implemented directly in activities that use it and have keyboard support... there are still some activities with readyButton that don't have keyboard support, but it is less relevant to add keyboard controls just to close the ready button if the activity itself has no keyboard support.)