- those can lead to errors due to circular dependencies
- making them runtime dependencies fixes this

- registered custom repr so it shows up in components
- some renames to make it more in line with the other extensions
- fix shapes to reuse existing geometries (fails to update on prop changes otherwise)
- added label to repr visuals on hover/highlight
- ignore light forbilayer planes mesh
- TODO: layer spheres seem to be broken (e.g. 3pqr)