Ancient End City [ModJam 2026]

Ancient End City structure now has a significantly higher chance of appearing overall. (from 1/3 scratter chance to 1/2) but it still remains rare enough because of how difficult it is to encapsulate a structure of this size inside blobs of end islands.

Removed the obsidian spawn rule because it had no impact, with or without it, the structure can still appear inside the main end island which has pillars running through it
the correct theory is that the obsidian pillars in the end dimension aren't part of the terrain, but rather structures that procedurally generate after end islands are generated, so the structure can still appear in the main island regardless, but will have pillars breaking into it most likely...