Add KCModuleData for shortcuts kcm

Unforunately we need to do DBus calls to find out about the current state and
we have to do it blocking because of how the mechanism works. On my machine
each DBus call takes under 1 milliseconds so a timeout of 5should be
fairly safe while not blocking everything for to long. If we see reports coming
in that it doesn't work we can rethink it.