Serialized execution of animated state changes

[peter-ha]

When e.g. in the IOT dashboard the user clicks the "up and down" buttons fast, there is no visual feedback of the button being in the pressed state. This apparently comes from the button being in the normal state again before the pressed state has been drawn. We need to ensure somehow that some states are drawn even when they are replaced by another state before the next draw cycle.

[uwerat]

Maybe stacking QskAnimatorHints for the affected aspects does the job.