[w3c/touch-events] Define interactions with `contextmenu` event? (#68)

Now that the spec is [relatively explicit about the mouse events to expect on a tap](https://w3c.github.io/touch-events/#mouse-events), perhaps we should also say something about `contextmenu`?

In particular, Firefox [doesn't](https://bugzilla.mozilla.org/show_bug.cgi?id=1256339) generate any `mouse*` events prior to a touch-derived `contextmenu` but Chrome does.  IIRC we did this in Chrome just to be consistent with the approach used for `click` - simulating the full event sequence you'd get with a real mouse.  But perhaps this isn't worth it for `contextmenu` (which also isn't preceded by mouse events when triggered by the keyboard).   If there's reason to believe it's sufficiently web compatible, then I'd support removing generation of the `mouse*` events from Chrome.  @dtapuska WDYT?

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