[Feature] Properly handle vehicles and vehicle spawns

[3ti65]

trafficstars

Current issues:

• No preview while dragging in, since no client entity. That's kinda okay tho, not a big issue.
• It doesnt create an entry in the hierarchy
• No gizmo shows up upon raycast selection, probably related to the issue above

To implement:

Implement support for VehicleSpawnReferenceObjectDatas, so editors can place vehicle spawns and they will get spawned properly as the engine would do it.

[Powback]

This is linked to #52 , will keep it open until solved though.

[3ti65]

• VehicleEntity is not handled properly
• AABB doesnt work
• Vehicles should probably only be spawned by VehicleSpawnReferenceObjectData, and those need to be handled as special objects in the editor.