[aapi] bug 7019 Actions

I've been looking at section 4.7 on actions to finish up bug 7019.  It looks like a lot of the work has been done, but here are things that need further discussion

Actions are exposed by the following rules
*             the element is focusable  [does being focusable enable an action?  What action?  Why?]
*             the element has registered a click event handler [hooks up click/activate action]
*             the element is xlink [what action does this hook up?  Navigate? Click/activate?]
*             the element has a WAI-ARIA role allowing action (see the following table)
*             the element has a WAI-ARIA state or property that enables additional actions

Should we merge the menu stuff in 4.8.4 with the first table in 4.7?  they seem similar.