Add menu to 3d scene and only update objects if they are visible

[pascalzauberzeug]

Motivation & Implementation

This PR addresses multiple issues regarding the 3d scene:

• Add menu to 3d scene to hide object groups
• Fix PathObject's event subscriptions on navigation change
• Only update PathObject and PlantObjects when they are visible

Progress

• I chose a meaningful title that completes the sentence: "If applied, this PR will..."
• I chose meaningful labels (if GitHub allows me to so).
• The implementation is complete.
  • Wait for Fix client handling in 3d camera objects and only update when visible rosys#339
  • Fix event registration for different navigations in PathObject
• Tests with a real hardware have been successful (or are not necessary).
• Pytests have been added (or are not necessary).
• Documentation has been added (or is not necessary).