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Do the same as in CppOutline

Otherwise we would filter out also e.g. all States elements.

E.g. "anchors {}" is represented in the AST as a UiObjectDefinition.
Treat it nevertheless like a property in the outline, such that it
isn't shown in the outline if you deactivate showing bindings.

Make sure the filter reevaluates all items when they change.

Requested by con.

Utils::NavigationTreeView is created - as a base class for any Navigation Widget (Side Bar) tree view

Merge-request: 2167
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>

The drop down combo box and the Outline in the sidebar now share
the same model.