refactoring to Vidget - Part IV.1: track api-changes in tests | use Display1 as sink of TestCaseFactory-DisplayTests
rename DocumentSchema to DigidocSchema
rename: VisualThingContentFacade => VisualThingsContentViz | SceneIo =>VisualThingsSceneViz | DigidocManager => DigidocViz | VisualThingContentFacade => VisualThingsContentViz | ...
refactoring to Vidget  - Part V: LayoutToolStrip | MarkerToolStrip