[PATCH] add option to break constructor initializers before colon

[Florian Sowade]

Hi,

the attached patch adds a clang-format option to always break
constructor initializers before the initial colon.

So this patch adds an option to turn

Constructor : foo(bar)
{}

into

Constructor
    : foo(bar)
{}

I don't know if this style is widely distributed, but I use it to
minimize the diff when I add new members to the list of constructor
initializers, since I can add a second member to the list without
modifying any of the existing lines:

Constructor
    : foo(bar)
    , baz()
{}

>From my understanding this is not possible with the current set of
options.

Florian Sowade
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