Three new map extras

[RarkGrames]

Summary

SUMMARY: Content "Added 3 new map extras"

Purpose of change

Adding three new map extras.

Describe the solution

Prison bus verson 1

Prison bus version 2

Prison bus version 3

Wasp nest

Dermatik nest

Testing

Spawned all of them to see if everything is correct.

[RarkGrames]

Are they going to spawn with the same chance?

[ZhilkinSerg]

Are they going to spawn with the same chance?

I am pretty sure we only support only a single update_mapgen function with a given id.

[RarkGrames]

I encountered all three version of it while testing, so it seemed to me that it was working.

[ZhilkinSerg]

I encountered all three version of it while testing, so it seemed to me that it was working.

Then each entry must have the same default weight.

[RarkGrames]

Ok, I don't think it's a problem for them to be not weighted, they are not that different.

[ZhilkinSerg]

You can change them unique ids and control weight via map extras, but we should probably just add weights for nested/update_mapgens in the future.

[RarkGrames]

It can wait until the update_mapgen gets weights. After all that will be more similar to how overmap mapgen works.