Make livetable suggest filters accessible

Making the livetable suggest filters accessible means in particular that the filter suggestions are made available to screen readers, so that the blind user can know of their existence when they show up.

Links:

• Accessible autocomplete: https://haltersweb.github.io/Accessibility/autocomplete.html
• ARIA combo box: https://www.w3.org/TR/wai-aria-practices/examples/combobox/aria1.1pattern/listbox-combo.html