[FR] Differentiate Bone and Structure Nodes in the Editor

[Dearliet]

It would be helpful to visually differentiate bone nodes and structure nodes in the editor by changing their icons and updating the name of the properties menu accordingly. For example, the properties menu of a structure node would no longer be called "Bone Display Properties" but instead "Structure Display Properties."

The functionality would remain completely the same. This naming change would simply be a natural consequence of differentiating between bone nodes that contain elements and those that do not.