Clang-format - always break after colon

[Денис Сенькин via cfe-commits]

Hi all,

Recently we have started using clang-format in our project. However, the it
clang-format does not support breaking after colon in constructor init
list, which we find very useful.
When we always break after colon, it is pretty clear - you always know the
arguments are placed below the constructor and you have not to look at the
previous line.

Also I have attached patch.

Regards,
Denys
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