Applet::globalShortcut becomes QKeySequence

- Port away from KShortcut
- Use QKeySequence instead of QShortcut (which might be the obvious
  choice, for two reasons:
	- QKeySequence doesn't require QWidgets
	- It's really all we need

This reduces KShortcut and QShortcut usage in plasma-framework to zarro.

scripting/widget.cpp

@@ -82,7 +82,7 @@ void Widget::remove()
 void Widget::setGlobalShortcut(const QString &shortcut)
 {
     if (d->applet) {
-        d->applet.data()->setGlobalShortcut(KShortcut(shortcut));
+        d->applet.data()->setGlobalShortcut(QKeySequence(shortcut));
     }
 }