suggestion: meshes.jl interop

[alok]

that would really increase the number of supported shapes and would be in line with what seems to be the most supported shape library in julia

[arturgower]

Thanks @alok, seems like a sensible suggestion. Certainly if we were to add other shapes, or more flexibility in shapes, it seem like relying on Meshes.jl would be good. At present we only have a few shapes, so probably not the best time to add Meshes.jl just for this.