* Most of the main entry points that can fail with relevant reasons now has a
way of specifying a message to return with it. This message can be displayed
to the user to give more information or context about an error.
* 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.
Fixed "IndexError: tuple index out of range"
`value = tuple(float(value[i]) / divisor for i in value)`
Was effectively attempting to access the value tuple using an element as an index.
`value = tuple(float(i) / divisor for i in value)`
Uses the elements from the tuple and modifies them.
Ex: (0,0,0,255) becomes: (0.0, 0.0, 0.0, 255.0)
Instead of throwing an error.
baldurk