[PATCH] clang-format.el: use -output-replacements-xml option

[Johann Klähn]

This patch changes the emacs package to use the chunks provided by
clang-format instead of replacing the whole buffer text. This should
lead to better undo behaviour and avoid jumping around of window
content.

Manuel, can you please test whether the new <cursor> output works? I
do not have a current build of clang on this machine.
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