New 'Exploded' visualisation mode in BufferViewer with new exploder controls
hidden when not in 'Exploded' mode.
Change 'solidShading' and 'solidShadeMode' to 'visualisation' and
'visualisationMode'.
Hide the 'highlightVerts' widget when using 'Exploded' vis for both
real-estate and practical implementation reasons.
* There's not a good accepted terminology for this kind of event, and for
historical reasons 'drawcall' has been the accepted term, even though
that can be quite confusing when a dispatch or a copy is a 'drawcall'.
* This is particularly highlighted by the event browser filters where
$draw() includes draws and dispatches, but $dispatch() only includes
dispatches, it's hard to intuitively understand why $draw() matches all
of these calls.
* As a result we've defined the term 'action' to cover these types of
events in the same way that we defined 'event' in the first place to
mean a single atomic API call.
Dan Hawson