Add wobbly antenna

[MrMinimal]

This PR adds a wobbly antenna because physics are fun (in case you want to add it).
Uses Godot's SpringBoneSimulator3D.

Screencast_20260311_223304.webm

[MrMinimal]

@KenneyNL I changed the PR now to be .glb only - no more Blender stuff contained.
It introduces an antenna which uses the same colormap.png texture all your other models do. No more work required, if you likt it you can merge it without any other conflict.

[MrMinimal]

The way I changed from Blender to is is I used https://github.com/CesiumGS/gltf-pipeline to convert the Blender .glb file to .gltf with gltf-pipeline -i antenna_extraxted.glb -o antenna.gltf --separateTextures. Then you can edit the texture and repack the .glb with gltf-pipeline -i antenna_extraxted.gltf -o antenna.glb --separateTextures.