unify code for list views

Joachim Wuttkerequested to merge
j.0 into main
  • xxxSet classes inherit common base class VectorWC
  • signals moved down in the class hierarchy, connect statements moved up
  • all item views are now of list view type
  • InstrumentsQListView emptied of all other functionality
  • overlay buttons and context menus removed: rm and cp now available through action buttons in top toolbar

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