Merge remaining funcionality of JobOutputDataWidget into JobResultsPresenter and delete obsolete JobOutputDataWidget

Remove ItemStackPresenter (which was only used in "single widget mode" anyway) from JobOutputDataWidget

...instead of MainWindow

pass current document to views, so they work on this document, not with global pointers and MainWindow

...instead via MainWindow

Moved some widgets from GUI/Views/JobWidgets to GUI/View/FitWidgets because they are (mainly) used there

This is more UI standard than the combo in bottom right corner.

As a consequence, hide the always empty status bar (for all views) and with this win more space for relevant content.

* reduce indirections
* reduce redundancy
* implementations in analogy to sample view
* rm job view docks class (integrated into jobview)