Reviewing EB terrains and altering as necessary to reflect the source biomes and/or produce effects

FYI: MCF #2161

This is happening in both EB Plateau and Snowy Plateau. Those biomes don't naturally have the mesa structure. Don't know if you are aware of this, but if not, you are now. :)

I replied to this in the thread, but these were probably just running default terrains I hadn't gotten to yet. I'm working on Plateau and I think the default was a terrainCanyon or terrainMesa, which would do that.

Finished in d86bed6