Fixes some QWidgets that Qt Creator tries to clobber. As a result, there are a couple spacers added now for the toolbars to align properly and a stretch policy on the main layout.
This re-adds the native attribute for the OBSQTDisplay that was removed in #3782. I believe this particular removal was an error, and there is no way around this entry being native since OBSQTDisplay extends QWidget
c4edb9a07f