kcmdlineargs input decoding

[Nick Shaforostoff]

Hi. Opening files with non-ASCII names via cmd line in any KDE app
isn't possible on my system,
as args are misencoded due to QString::fromLocal8Bit() returning
different data before and after QApplication creation.

Attached patch fixes the issue by delaying conversion and moving it to
KCmdLineArgs::arg(),
as a side affect it switches KCmdLineArgs args processing to use
QByteArray internaly,
which is a little bit more memory efficient.

Please review.
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