Clang-format: add finer-grained options for putting all arguments on one line.

[Russell McClellan via cfe-commits]

Attached is a patch that adds two new options,
AllowAllArgumentsOnNextLine and
AllowAllConstructorInitializersOnNextLine.  These mirror the existing
AllowAllParametersOfDeclarationOnNextLine and allow me to support an
internal style guide where I work.  I think this would be generally
useful, some have asked for it on stackoverflow:

https://stackoverflow.com/questions/30057534/clang-format-binpackarguments-not-working-as-expected

https://stackoverflow.com/questions/38635106/clang-format-how-to-prevent-all-function-arguments-on-next-line

Thanks for your consideration, and let me know if there's anything I
can do to improve the patch; I'm a first-time contributor.

Thanks,
-Russell
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