D9803: Apply some C++11 niceties, styling consistency

[Aleix Pol Gonzalez]

apol added inline comments.

INLINE COMMENTS

> plasmadesktoptheme.cpp:160
>      QPalette pal = palette();
>      static const QPalette::ColorGroup states[3] = { QPalette::Active, QPalette::Inactive, QPalette::Disabled };
> +    for (auto state : states) {

if you make it `auto` the initializer_list will be used not requiring the allocation AFAIU.
That said, I wonder if the compiler can unwind a foreach.

REPOSITORY
  R858 Qt Quick Controls 2: Desktop Style

REVISION DETAIL
  https://phabricator.kde.org/D9803

To: Kanedias, mart
Cc: apol, plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, mart
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