TransportationObject model rework

What does this MR do?

Reworks the model of TransportationObject to be able to correctly parse and hold CityGml 3.0 TransportationObjects.
Fixes that some of the Featuretab-Treeviews were being incorrectly rebuilt after a search or search clear.
Fixes that BoundingBoxCalculator ignored geometry data from CityObjects added in 3.16.0.

Related issues

#105 (closed)

Checklist

• Commits squashed, following the message-template and containing changelog-trailers
• MR title and description are up to date, accurate, and descriptive.
• MR targeting the appropriate branch.
• Latest Merge Result pipeline is green.