add extra keyboard controls as per W3C recommendations for combobox #170
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Add four extra keyboard controls for as per recommendations from the W3C
https://www.w3.org/WAI/ARIA/apg/patterns/combobox/#keyboardinteraction
Control + Home(optional): moves focus to the first row.Control + End(Optional): moves focus to the last row.Alt + Down Arrow(Optional): If the popup is available but not displayed, displays the popup without moving focus.Alt + Up Arrow(Optional): If the popup is displayed: