Support specifying roles for things to click/set

[mfulton26]

Examples:

await automator.click.button("Process Payment"); // click a button
await automator.click.link("Process Payment"); // click a link
await automator.click.menuitem("Process Payment"); // click a menuitem
await automator.click.command("Process Payment"); // click a button, link, or menuitem

await automator.set.textbox("First Name").to("Joyce");
await automator.set.radiogroup('Shipping Information').to('2-Day');

Note that this proposed syntax uses WAI ARIA Widget Roles.