Events post-processor: consolidate events that "babble" #1546
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It seems possible to end up with events that bubble for some target interfaces but don't for other target interfaces, see discussion in: w3c/webref#1212
The post-processor already knew how to assign a bubbling flag per target interface because we make a distinction between interfaces that are in a bubbling tree and interfaces that are not.
However, the post-processor did not know how to consolidate an entry that appears duplicated in the events extract because the underlying event bubbles in one case but not in the other. This update makes it able to consolidate these events (which I call "babbling" events because, hey, it's Friday evening).
We still don't have post-processing tests but that seems to work fine on Webref data.