Artifacts - Setting to prefer having one of each type before duplicating

[RubioNubio]

It would also be great if the map script could somehow spread the different types over the map. It can become *extremely* imbalanced when a faction has 3+ of the same one, especially when there are only ~six on the whole map... Just finished a Very Low artifact spawn setting game where the AI Necrons spawned in a corner next to *three* of the 20% health artifacts