update role allowances for button and input type=button #1301
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ARIA in HTML is planning to allow
role=comboboxon abuttonandinput type=buttonelement. This PR updates the validator to allow this role on these elements.Adds
role=comboboxas an allowed role forbuttonandinput type=button.Additionally, this PR adds
role=checkboxas an allowed role forinput type=buttonto match thebuttonelement allowances. This was an oversight in the spec which this PR will help correct.