* We also make the frame counting consistent: Frame 0 is the frame from
device initialisation to first present, Frame 1 is from first present
to second, and so on after that.
* Dock panels shouldn't have any frame border or anything like that.
* They should have an external margin of 3 pixels at their border,
but then no further margins on the layouts (like sub-controls for
the pipeline state views.
* Toolbars should be Raised & Panel frames. Later we'll replace them
with actual QToolBars to better customise the painting.
baldurk