Add interface for Arepo

[rieder]

Recently, the moving mesh code Arepo was made public (https://arepo-code.org/code-repository-online).
It would be good to have an interface to this code in AMUSE.

If anyone is interested in picking this up, please let us know!

[rieder]

Our proposal for RSE support from DiRAC to work on this has been accepted, so this will be worked on.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 365 days if no further activity occurs. Thank you for your contributions.