This switches comment voting to use the "toggle buttons" that most other
actions are using (e.g. Bookmark). This makes it so that only the vote
button is replaced, instead of the entire comment's contents. This is
mostly significant when the comment contains a <details> block, because
previously voting/unvoting while one of those was expanded would cause
it to collapse when the comment was replaced.
As another side-effect of this, voting will now always appear to
increase the count by 1, and unvoting will always appear to decrease it
by 1. Previously it would re-query the comment, which could result in
larger jumps in the vote count if other people were voting at the same
time. That confused some people, so this will probably be better.
Deimos
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