Fixes incorrect button color. DecorationOptions and PlastikButton are
both connected to decoration.active and the button gets invoked first,
thus the titleBarColor is still for the previous state. This was fun!
Adding a KConfigXT xml file and an ui file to configure the QML
variant of Plastik.
Currently supported options:
* title alignment
* title shadow
* animation of buttons
Missing option:
* colored borders
The Plastik decoration buttons are provided by a declarative
extension plugin as the canvas drawing API would be needed to
draw these buttons. This should be changed with Qt 5.
But it's also a nice example to show how a QML based decoration
can have an extension in C++.
