Prep work for Magiclysm dragon lair and adds underground terrains/furniture #33877
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Summary
SUMMARY: Content "Adds new underground terrains, furniture emitters, draft black dragon lair map"
Purpose of change
I begin adding a Magiclysm lair and the extra content keeps expanding so I've decided to merge the new terrains, emitter furniture and a suppressed special (black_dragon_lair) utilizing the new content.
Describe the solution
By adding this content early, I hope to make it easier on reviews and also people who may want to consider monsters/item content for the lair.
Describe alternatives you've considered
Leaving the map out, but I thought it would be good to make it available for other content creators. It still needs monster and item spawns.
Additional context
I'll reserve posting screenshots of the mapgen until it's finished unless requested. I've set occurrences to 0,0 so it won't spawn in game.