Add attributes ordering to the DStyle

[wilzbach]

As discussed in dlang/phobos#5529 (comment)

FWIW at some point we might want to agree on an idiomatic ordering on the attributes
Alpha

[dlang-bot]

Thanks for your pull request, @wilzbach!

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[andralex]

Please also add "(the ordering should ignore the leading @").

[wilzbach]

Please also add "(the ordering should ignore the leading @").

Done:

[andralex]

Great! Once approved, you can merge this yourself. Do you have the appropriate rights?

[wilzbach]

Great! Once approved, you can merge this yourself.

I try very hard to not to merge by own PRs ;-)

Do you have the appropriate rights?

Yup.

[andralex]

I try very hard to not to merge by own PRs ;-)

Merging your own PR after it was approved with suggestions by a member with write access is entirely legit. In fact it's the only possible flow on phabricator.