Summary:
over the past 20 years smb has gathered a whole bunch of different
styles with varying indention and code styles. time to unify again

I've done some cherry picking of the clang-format run since it had
a tendency of worsening some long lines.

Test Plan: builds and still lists stuff

Reviewers: ngraham

Subscribers: kde-frameworks-devel, kfm-devel

Tags: #dolphin, #frameworks

Differential Revision: https://phabricator.kde.org/D27676