Merge topic 'clang-format-6.0'

1b65e041 clang-format: add formatter for version 6.0
705a43cc format.all: exclude clang-format-* since they are version-specific

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !11
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failed source-formatters-megas-linux

failed source-formatters-megas-linux

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