Feature Request: Menu Item Actions and disable

[TheNando]

The menu and menu item are very useful for providing the form for a menu, but their function is limited to displaying and hiding the dropdown. Some other useful features would be menu item selection events one could listen for to execute their action.

The disable property does seem to apply a desired styling. It would also be useful if it prevented the event from being emitted if the attribute is present.

Introducing these features would also provide needed context for this pending issue ( #336 )