Model visualization properties in UML
Use map for input properties
Merge branch 'master' into visualization

Conflicts:
	src/widget/DataVisualizerUtilities.cpp
Merge branch 'master' into visualization

Conflicts:
	src/widget/DataVisualizerUtilities.cpp
Unify edit trigger of list views
Remove edit context menu entries
Fix undo command name
Add empty input delegate
Derive observer view from list view, use input delegate
No columns in observer views
Display widget in input list view
First version of input item editor works
First version of display item widget
Initialize visualization properties of input model