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Fixes #232
This PR adds an option to register a keyboard event for capture phase (instead of the default bubble phase). Capture phase handlers are fired first, before any child listeners, allowing global overrides of events.
This is useful for undo/redo which is also handled by entry boxes and results in confusing undo/redo behaviour depending on the currently focused dom element.
This PR also stops propagation of the recognised up and down events and also prevents the default event firing. This is required for capture phase handler, but is probably also desirable for bubble events. This change needs testing.