Remove KDE4Support dependency from plasma-frameworks (almost)

Stop using classes from kde4support:
- KComponentData is deprecated, it will be using QCoreApplication::
applicationName() and QCoreApplication::applicationVersion(). Of course,
this means that the existing shells will have to be ported. I have no
problem with doing that port myself, if I'm told where to look into.
- Drop usage of KLocale, ported to QLocale
- Drop usage of KStandardDirs, ported to QStandardPaths
- Drop usage of KIcon, ported to QIcon

Furthermore, there's a module in src/declarativeimports/locale that IIUC
exposes KLocale bindings to QML. A specific plan to port it should happen
as well.

REVIEW: 113920