RFC: Running clang-format across all Plasma (and more?) repos

[David Edmundson]

> Presumably this would impose a common coding style throughout all KDE
> repositories? Or would each project be able to specify its own clang-format
> configuration? In past discussions about KDE coding style, it was accepted that
> while Frameworks and PIM libraries would adopt a common style, Applications
> would be left to decide for themselves.
>

It would definitely have to be opt-in.
Right now I'm only aiming for adjusting everything that's part of Plasma.

David