Summary:
Apply the KDE HIG, use form layouts, make desktop files consistent and make the KCMs look better.
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Test Plan: Open the {nav Window Behavior} KCMs. All options should still work
Reviewers: #kwin, #plasma, #vdg, ngraham, zzag
Reviewed By: #kwin, #plasma, #vdg, ngraham, zzag
Subscribers: ngraham, davidedmundson, zzag, #vdg, #plasma, kwin, #kwin
Tags: #kwin
Maniphest Tasks: T10273
Differential Revision: https://phabricator.kde.org/D23615
