644 - backspacing out from within strings/comments

I'd worried last night that I'd have to track the points where
comments/strings begin, but at least so far this is elegant. Might run
into problems when I try to backspace over strings after ending them.

And backspacing over comments after terminating them is a whole
different ball of wax. We still can't backspace over newlines because we
can't move the cursor across lines because we can't tell where our
cursor currently is. And even if we could tell we'd need to track how
long each line is. A new data structure is needed..

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