All block reporters to be clickable in dev mode

In dev mode you can now right click a speech bubble as a block is
reporting to inspect it using the developer menu.
Naw, this is just a quick'n dirty kludge and doesn't solve the problem. Let's step back for a while and get Snap back stable again. Then (like, sometime next year :-)) we can discuss whether we need this feature at all (I strongly feel we don't, because we can perfectly well just take a screenshot with the scripts pane texture in it - so what?). And if we decide we really *need* this feature we'll implement it *right*, which is to export a *single* picture of the reporter along with the value bubble. But let me stress this once again: I don't think introducing this feature is even worth the discussion. Did you guys try exporting a picture from Scratch 2.0 lately? Yet somehow MIT manages to churn out first-class documentation for Scratch no problem. Please don't ask for features just so the ball is in Snap's court!